The Human Torch said:
I could care less about Twilight, I thought that the movies were terrible (my girlfriend downloaded them and I had the bright idea of watching them...), but if so many people buy the books and see the movies, than that is quality to someone.
It's all in the eye of the beholder. I have had great fun with games that most reviewers said were shit, so yeah, I thought that it was good quality.
First off, "I could care less" implies that you do in fact care. "I couldn't care less" is the saying you're looking for methinks. Sorry 'bout the grammar-nazi schtick but that one bugs the hell out of me for whatever reason.
Second, "quality" is not a subjective measure. There are purely objective metrics over the quality of everything in existence. Whether or not it's "good", meaning enjoyable/workable, is subjective, yes, but "quality" is a completely separate beast.
Brief synopsis of "quality" metrics in literature (as I'm unqualified to do so for movies and don't want to put forth the effort to make a list for games):
-Plot - coherent, logical (in-universe, if nothing else), and concise
-Characters - distinct personalities and realistic, understandable behavior
-Prose - engaging and thought-provoking
If a work of literature meets these criteria, it's a high-quality piece of work, regardless of how well it sells or what people think about it. Similarly, if it does not, then it's a low-quality work, once more regardless of what people think about it.
People can like poor quality goods all day, and oftentimes they do. It doesn't mean anything bad, it just means a low-quality work appeals to their sensibilities.
Thus, sales does not equate with quality.