You haven’t so much criticised someone’s work so much as you have trash talked it. Saying “oh, i guess anyone can put anything they want on the marketplace now without meeting some sort of minimum level of quality” is not really a valid form of criticism, it’s trash talk, nothing more. You don’t need to love everything everyone does, and you are well within your rights to voice when you don’t, but there are better ways to do this.
Likewise, your attempt at constructive criticism isn’t at all constructive. You need to be specific when giving constructive criticism, pointing to specific points or features and explaining why you feel they are not up to scratch. All you have said is more of “I don’t like this thing because I think it’s ****” and further insulted the author by claiming it’s their first mesh they’ve ever made, when, unless you happen to be close to the author, I doubt you have any grounds or reason for this…
Also try to understand that your opinion is just that, and art is entirely subject to opinion. Just because you think something is mediocre does not make it factually so. Based on the images provided, there is nothing wrong with the model on a technical level, which leaves the remainder of it, the aesthetic side of it all, down to personal taste. Might pay to remember that you opinion is not truth - it is just opinion, as is everyone elses’.
But at the end of the day, I have to ask - why are you commenting in here? You said your piece… so why continue to engage if you are so uninterested in this model? If it gets to the marketplace, how does this impact you in any way? There are certainly worse/less well made models on the marketplace already, and as I said the visual side of it really comes down to personal taste and opinion… so just move on and stop spreading negativity and hatred where it is not warranted.