Some interesting discussion today, itt.
Lemon kind of touched on this and no doubt I've said it before, but I think with nearly 30 years of changes in taste for both producers and consumers, it's inevitable that Akira does not hold the same broad appeal to the anime fandom now that it would have done during the '90s. Look at what the typical big shows are now and look at Akira. Personally, I don't think it's an age thing and I don't mean to suggest that everyone coming into anime within the last few years only cares about cute girls doing cute things, but I think the typical new fans are following what is produced in the biggest quantity, and that is clearly things which are not like Akira.
Plenty of people will still hold it aloft as one of the greatest anime productions ever, but how many of them stopped following anime years ago, or maybe were never big fans in the first place? Some newer fans may also resent it as something blankly hoisted upon them by the old guard - I know that Daryl Surat suggested many people took against Bubblegum Crisis for such reasons.
Not saying I wouldn't go back in a heartbeat to having us all skip hand in hand through the fields with Armitage III on a constant loop, but change is inevitable and people will always come along to crap on your idols, whatever they may be.
tl;dr: If people don't like Akira now, it doesn't surprise me.
Actually I've been pondering recently, was there ever any consensus about what the 'Akira' power itself is a metaphor for? Someone the other day told me he reads nuclear power into it, but I don't really find it convincing that a film set in a world already ravaged by nuclear war would need a metaphor for that. Anyone have any ideas? I have a film studies article about Akira somewhere, so I'm trying to dig that up.
Maybe I'm reading too much into it, but the film seems to touch on a lot of the experiences and fears of the baby-boomer generation - not just the a-bomb, but also the aids crisis, student riots, alienated youth, vivisection, the olympics putting Japan on the world stage, and so on. Akira himself represents destruction, but also a kind of cleansing - perhaps it's all just fear that the boomers are the ones who screwed everything up and a desire to go back to what things were like before?