Sales definitely doesn't mean whether or not a game is good, however I think the people you're referring to are mostly exclusive to this site. The graphics and power people are much more common. However, in regards to your comment about sales, for some people they believe that as a result of a game being good, it should have higher sales rather than high sales being something itself that makes the game better.
Sales is much more to do with business in the realistic sense, and I would say higher sales give a game a better chance to gain more exposure and have more games like it come out (not rehashing). /redundant rant over.
graphics and power people are much more common because that is something that actually effects the game you play. Like it or not graphics are going to factor in if you were to objectively review a game, its even one of the categories, if a game graphics is bad to the point where there is screen tearing, lag, pop up etc. you bet people are gonna care.
I would disagree with those people personally i dont see high sales for game and i think its good I see it and think its readily accesible. Not that much different from movies, IE Transformers. And we all know 90 percent of the time high sales do lead to rehashing and to games like it as well.
I think what you're referring to is more graphical fidelity than the graphics itself. I'm not trying to say graphics don't matter at all, and that power doesn't matter at all. More power does make more room for activities and graphics has a certain amount of addition to gameplay that may sometimes even be necessary. The problem I have is when people don't understand those purposes and place these two things above all else. I enjoyed SNES games and still do, yet the graphics on the SNES is absolutely horrid compared to the current graphics we're producing.
fair enough and i was talking fidelity