I saw it today and loved it. There is good balance for all the characters, lots of action, a decent story, and....no freaking shaky camera work. I could tell who was who and what was happening in the action scenes. Wonderful.
I thought there was good use of humor in the movie too. Tony gets several lines that I thought were funny - Shakespeare in the Park cracked me up. I see Whedon in a lot of the dialogue. I think it worked really well for the movie.
I have no clue who that red face guy is. I figured he was some big bad guy and something is being set up for another movie, but I didn't know what. I even though to myself after the scene was over, who the hell was that?
It's a great movie..definitely worth seeing on the big screen. I saw the normal version, so I have no idea about the 3D. I did read that it was 3D conversion after the filming was done.
I'm sure I'll be seeing it again in the theater and I'm definitely getting the Blu-ray. I've already read that the first cut of the movie was like 30 minutes longer and that extra footage will be on the DVD/Blu-ray.
Mark Ruffalo is fine as Bruce...but I did miss Norton in the part.
Seeing how good this is makes me wish that the Wonder Woman movie Whedon was going to make hadn't fallen through. Though if he had made that one, he may not have been able to make this one. It wouldn't have been the same with a different director. Yes it could still be a really good movie, but it wouldn't have his touch that comes out in little things here and there that I loved.