It’s a great movie. It’s fun and plays with the tropes of superhero movies. Under my friends’ advice, I went and saw it in 2D. The 3D made the movie darker and they felt some of the beginning of the movie was too hard to see.
One thing you’re probably not going to like is the lack of gender and ethnic diversity. This made me sad since generally speaking my favorite avengers are the women, and I think from the way he’s usually drawn, the Falcon is one of the most attractive men of Marvel. What makes this particular bad to me is that there are tons of women and POC (green and blue don’t count) in the Avengers to chose from.