I have a couple points I’d like to add on this one and maybe a couple ideas for improvements 
Price Point:
I believe in many cases, you are getting a great deal! You need to factor that people are likely spending in some cases a couple of hours or maybe more. The hourly rate can vary from artist to programmer but the price points are in many cases far cheaper 99% of what you would get typically if you hired directly or outsourced.
Quality:
This is a tough one. A good chunk of what I’ve personally seen, IMHO, is no where near what I consider “AAA”. However, there are actually some pieces of content that I’ve seen that is extremely high quality work and ends up being a steal for the buyer in more ways than one (hobby or commercial project). The Marketplace is also new so it’s best not to jump the gun and instead provided some concrete examples on how to improve it. But the processes of getting the content in peoples hands is only going to improve over time so I’m sure you can look forward to more ways to “Preview” something before purchasing. Another key thing is AAA work can cost in some cases thousands of dollars so you need to keep things relative. But in 9/10 cases, the price is more than worth what you are getting than what you could be paying for Professional assets.
Also, you never know if someone has a natural talent even if they haven’t shipped a successful title. It doesn’t mean their work would be less quality of a industry-proven professional, it just means even though it’s highly unlikely, it’s possible you would be far beyond impressed for what you paid for in the end.
At the moment, I personally haven’t purchased any Marketplace content but I do purchase SpeedTree assets and am looking at some sites that have a great track record for accurate PBR textures/materials. I think, and this is just my opinion, it’s best to have them created specifically for the project so that they are unique and were crafted to specifically fit your game world and design. But I’m sure it’s also in the Eye of the Beholder and also is a case by case depending on the asset in question.
Now I do agree with those on the topic of knowing the background of a content creator or developer before purchasing the content. I don’t assume to rate someone’s background on a couple renders as it doesn’t tell me much about their standards, contributions, work ethic, passion, etc. I absolutely don’t care or not if they have a track record at big name studios as much as what games did they contribute to, how much did their work influence the final product and also in general, how polished were the titles they were working on. That tells me a great deal about someone’s background and hell, I might want to have a call with them to find out more about them and what drives them whether it’s passion, a hobby, or just simply a quick buck and no heart.
There is nothing wrong with those in the community who do this as a hobby either. However, if I were to purchase some assets, I’d want to know that going in to make a more educated decision on whether the price fits the level of quality and experience from the person creating it.
I’ve seen many bad reviews so I don’t spend much time looking at the new posts unless something catches my eye. The more I see them, the more I back away from checking them out and I’m sure I’m not the only one. That’s a bad thing and probably hurts people from even more sales and also takes some quality/expectation level of the Marketplace in general down.
Some Ideas To Improve This:
Now let’s not go ahead and compare Apples to Assets/Development, not anywhere close 
Let’s think of a couple positive ways to turn this around and get people more excited and confident in their purchases…
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For 1, I think there needs to be a deeper level of inspection of the assets in question by Epic (which I assume you already do to a degree). If people are complaining about UVs and the such, these should have been picked up by those inspecting and I would hope those people were all refunded if they didn’t get what they purchased, right?
I haven’t purchased the assets so I can’t assume this aside from going off of others comments and reviews. But if they are true and some pieces of content are causing more headache for those trying to implement them and/or things are incomplete/broken, then something needs to be improved during the process of the content getting it’s final approval from Epic. This is a win win for Epic and those making the content will get more sales as those purchasing will have a higher confidence level in coming back more often.
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There should be a direct review option right on the primary Showcase page for the content in question. Akin to Newegg’s or Amazon (can’t remember) where you have to be a verified owner of it before it can be reviewed but have it front and center with their content. Also, implement a way that the creator can have direct dialog that others can see to see if maybe a fix or solution came through that would otherwise make you avoid the purchase. This would also give the creator an opportunity to highlight their level of transparency w/ their customers and make them feel confident that you’ll work your butt off to make any negative a positive. This speaks a lot about the creator and is a plus!
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For previews, create a web service that can automatically throw a UE4 water mark on the image and make it mandatory during submission (in the example of art assets), to also submit things like a High Res view of UV’s, wireframes, poly/vertex density, material instruction count, etc. Considering UE4 now supports HTML5, then I’d like to think Epic is one step ahead and creating an HTML5 app that acts as a Turntable maybe w/ HDR Image Based Lighting 
That would be huge as the user doesn’t have access to the asset, but they can see it from all angles, far away or up close, different lighting conditions, maybe under certain post processing conditions, etc. This would give people the ability to actually preview before buying. That would prob be a big game changer. But I think Epic, if it’s not already being done, a preview HTML5 app that can do that but also load other assets like custom Post Processing, sounds (w/ watermark), but maybe a specific sound cue to hear spatially how it would sound in 3D, etc. All positives to know what you are actually buying.
In the case of Blueprints, even if a developer puts one that is able do what they claim, it doesn’t tell me anything about the level of optimization, variable/comment/tooltip management, readability, etc. So doing something to also show this off would really be a plus.
- List the background of the creator
- Shortened Resume
- Notable Projects
- Notable Companies
- Years in the industry
- Asset Creation Software/Middleware/Engine experience and years spent
- How many completed projects?
- Links to reviews of the games they completed
- etc.
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Community reviews of a Content Creator. So not just a review for a specific item, but for the creator themselves. It doesn’t have to be specific as those can go on the content page reviews but something that highlights a general consensus from those that purchased their content.
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Finally, maybe Epic does something like adds a “AAA” Epic Seal of Approval for pieces of content that over deliver and/or would be accepted based on their standards from their own in-house teams. This may influence and/or motivate others to improve their standards. I understand this would require Epic to spend more time/money on review so it might be possible but as I’m thinking about this one, I’m starting to think this should be highly considered. Also, I’d add a post once a month that highlights deals on the marketplace considered by Epic, to be at a high level of quality (doesn’t have to be AAA). But a couple ideas for giving the creators some more exposure and highlight the gems already in the Marketplace.
At the end of the day, the amount of time and money, even if we compared an entry level artist or programmer’s salary, would still exceed the costs in almost all cases that you will find. In the end, I think if some of the things I mentioned above happened, then you can at least feel confident in your decision to purchase it.
My recommendation is if this were a hobby, unless you have money to spend, either grab what you can find for free on the internet or pick up a couple lessons and create it yourself. There is also nothing stopping you from linking up with others that can create it where you work together on your project.
Anyways, hope I was able to share a couple opinions and thoughts on how to improve this, enjoy the 4th everyone 