I really enjoyed the movie, they really went all out in using the heroes, incorporating fights with each other, and exploiting nearly all of their characters' potential!
Two negatives though: Hawkeye spent to much time as a bad guy, and I would've liked to have seen a new villain.
As for the 3D: It was good 3D, with nearly every scene having a sense of depth to it, but (for me at least, and I'm a fan of 3D) it wasn't pop-off-the-screen amazing. (of the 3D trailers, "Frankenweenie" actually had the best 3D depth I've seen in a while)
—Charles
