Got back from seeing it this morning. I went to the first showing of the day and it was nearly packed! Apparently the movie did about 80.5m on Friday and could break Harry Potter's record for the biggest weekend! Crazy!
I really loved every second of this movie. It really was the perfect marriage of casting, writing and directing. And man, the special effects were great. This was definitely the best Hulk has ever been CGI-wise (and hats off to Ruaffalo for finally making Banner interesting!) and Loki's army looked great too. I agree they were pretty easy cannon-fodder, but that's okay.
I loved that everyone got a little moment to shine. I think Black Widow, Hulk and (of course) Iron Man were probably the best served. Thor was really good, as always. Hemsworth would have been a great He-man if he wasn't already engaged. He looks great, he does the anger bits well but also is great at the softer and more comedic moments. I thought Cap was really well handled, but I feel like they held him back a little because they plan to develop his "man out of time" angle more in his next movie. I think he really emerged as a good leader and I believed him as that. I just thought he got less "cool" moments. But he was great in action. Hawekeye really did get the least to do. But we also don't know him that well. Renner was great as Hawkeye. But I do wish we'd get a Black Widow/Hawkeye movie to flesh those two out more. I'm so glad they built up BW more here and stuck to the comics. It was unclear how they'd go with her based on her Iron Man 2 appearance.
My only complaint was Maria Hill. She was fine, but I would have liked her to be more of the hard nosed you-know-what she is in the comics. That's what is so great about her character. The character could just as easily have been Sharon Carter, but maybe they're saving her for a Cap sequel.