This was a serious attitude and a common one at that. So yes, I was happy when fandom seemed to say "enough" and the trolls were driven back. Unfortunately, five years after the books finished and a year after the movies have, there are still some people stuck in the past. These poor dears, when using such well-reasoned arguments as "So-and-So is a Mary Sue!" are often left confused when these arguments meet resistance. Everyone over at FictionAlley and their insanejournal community thinks they're brilliant, so what's wrong with these people at LJ and tumblr?
The problem isn't that you dislike these characters. I don't care much for the twins or the Marauders. I don't hate them, I