A 3 star sound pack is WAY better than no sound or bad sound…
Answering the OP, if you’re contemplating putting some effort into providing something for the Marketplace, I think the advice so far is a little one sided. There is plenty of space for non-custom tailored music. They can always opt to ask you to customize it a bit.
Tl;dr: A generic and forgettable but OK sound pack has a market. Something above losing customers or they turn it off, but less than a dedicated sound artist. Just understand who you’re targeting and what they expect. And key is the UE4 and game friendliness of your pack.
Don’t provide awesome and super unique. Provide something generic that is packaged for being used in a game.
Someone has to provide the music just so a game can ship with some sound. OK sound is great! Emphasis on the game can ship. Emphasis on OK sound. (player keeps sound on).
I don’t confuse music being associated with a bad game as bad music. Not related at all. We’ve all heard certain classic/older music re-used tons of times and i personally have not burned or smashed my computer up because i got offended by hearing Chopin or Debussy for tenth time. Why?, because sound is in a supporting role. All the blockbuster movies are re-using slightly tweaked scores by same folks. I did not storm out of the theater or my living room while punching everyone in arms reach…
Anyway, Nawrot had the best advice, make the sound pack game friendly if you wish to succeed. No track dumps. Show some effort/understanding of UE4/games. Presentation and packing is way more important than sound. The actual sound is very in the “Ear of the listener”… Unless it makes your ears bleed, or you clearly don’t want to listen to it after a couple of loops because of its mechanics.
A 3 star sound pack is WAY better than no sound or bad sound…
edit: just to clarify, the sound pack itself needs to be a 5 star overall because its easy to integrate, provides some BPs snippets or code, and has no glaring issues where user will turn it off but the sound being 3 star/generic is fine.