It's true--I'd prefer Edward Norton to Mark Ruffalo, I didn't get why a dude with bow and arrows or a chick with a gun would matter, I've never see "Thor," and I was wary of what direction Whedon would go in, given the atrocious Buffy comics, but good lord, did this film rock my socks off!
The action is kick ass, and the Hulk is easily the best avenger of them all, hands down. The film wasn't too long or too short, fast paced, witty dialogue, and I cannot wait until the sequel (which has to be both penned and directed by Joss like this one). For realsies. Oh, and I'm buying this as soon as it comes out!
Go see it if you haven't.