Well, I suppose there has to be some truth to it because I post here and rarely other places. But I honestly don't see the core tastes of ASF posters being, generally, that different than the Japanese who buy Blu-rays. This place loves lolis, imoutos, idol shows and moe. And the huge mainstream shows that dominate sales (Isin, Shingeki, Madoka, S;G etc) are hugely popular here. About the only major area I see as being underrepresented are fujoshi, which you see with a hit series like Kurobas getting very little discussion.
I don't see hipster as a pejorative, though that's how it's typically used by fans of moe and imouto and harem shows to describe anyone who dares to disagree with them. Obviously elitist is a derogatory term anywhere, though the haters use it and hipster interchangeably as if they were synonyms.
I actually got quite irritated and I lashed out more than I intended... so I had to do a lot of editing to my posts. Probably will need to edit more because it still sounds too harsh.
My brain is completely not working atm which is why I blurted out the hipster/elitist phrase, but I meant to use it a positive term not a negative term. What I was trying to say is that at least to me Animesuki isn't swayed by the hyperpopularity that plagues other major forums/communities have. It's still effected no doubt, but no where near the amount it affects other forums. Also, I just generally find the average poster on AS "smarter" and have "better tastes" than your typical anime fan. I don't mean to bash this but it's like comparing the
Spoiler for Criticising a certain blogcommunity here.:
RC community with the LiA community. I can see a definite difference at times. Apologies to criticising a community site that you're part of, but I'm more talking towards its viewers not the writers. I think Kairi and Zephyr has some damn good taste and Stilts has been slowly converting to this realm to because of yourself and them I can tell because everytime I listen to a RC podcast, his opinions become more closer to mine or yours over time.
As for mainstream, unless if your definition differs I disagree. When I talk mainstream, I'm talking about the hardcore latenight audience, where stuff like popular LN adaptations, harem comedies and merchandissable females dominate the industry. To me the Japanese otaku audience and your typical non-Japanese speaking anime fan that are really into that stuff are nearly identical.
Outside of that, I think ANN represents the anime mainstream for the English fandom if they do not fall into the above category.
Though if you want to go beyond that and talk about mainstream in society as a general... Ghibli. That is about it.
EDIT: Brain still not working. Edited this response like 4 times by the time you read it...