While it's true that your personal opinion of a game may vary, the fact that the game has received positive reviews is a prime indicator of its quality (else we wouldn't bother making or looking at reviews in the first place.) While there certainly are outliers on either end (good games with bad reviews, and bad games with good reviews), there is an established correlation between popularity and quality and it holds true in the overwhelming majority of cases.
Perhaps we're using different definitions of "quality" here. Your definition seems to be stating it's quality can be determined by the total number of people it entertains; Mine is specific to me, as I don't believe my opinion as to whether it was "good" or not carries any weight to anyone else. My opinion isn't any better (or worse) than theirs.
So I could claim the game is "good" and you claim it "bad" and neither would be wrong. That is what subjective means, after all.
As for my pointing out a fallacy being a fallacy, Neo already explained that: it's only a fallacy when my pointing out a fallacy is used to discredit arguments that aren't supported by the original fallacy, which I don't believe I was doing.
As for exceptions to appealing to popularity, if we assume whether something is "good" or not is determined by popularity, of course using popularity isn't a fallacy. However, I don't believe that is what "good" is determined by, and nor do most art critics (whether you think such people are valid authorities on the subject is up to you, though). My definition is more personal; if I liked it, it was "good." Other people might have more objective qualifiers like "sophistication" but I don't think you have to limit yourself to their definitions either.
oh, for fuck's sake.
No, popularit does not equal quality, and vice versa.
No, the quality of something has nothing to do with popularity. Popularity is the result of clever marketing, quality is the result of components working well together, with none lacking or being left out.
Personal opinion has nothing to do with quality, it merely affects personal perception of the product.
No, just because the masses scream out for Twilight does not make it a good book. What makes it a good book is the quality of writing. And the quality of writing of Twilight is average at best, which makes it an average at best book. A popular one, but average nontheless.