I don't know if this is true, and it's hard to really tell, since of course 'the Pokémon fanbase' is a very vague and hard to define group of people. It's just an observation that I made when I visited the Pokébeach forums yesterday. The discussion over there is a lot calmer over there than it is here - because no one over there seems to be desperate to defend the game against the others. Most people are critisising the game, and the few people who aren't, are just talking about the game without the phony praising and without attacking people who don't like it. Here on VGChartz on the other hand, there's an overwhelming amount of unnecessary provocative comments ("And the haters can't stand that it is a good game.").
Unless I'm at the wrong part, it seems like that's a very sparsely populated forum. Most topics haven't been touched in weeks, and there hasn't been a post in nearly 24 hours. Not sure how much you could say about the fanbase based on that.