My top 5:

1. Batman Begins
2. X Men 2
3. Iron Man
4. The Incredible Hulk (the remake)
5. X men 1

Honorable Mention: Spider Man 2

Amazing how 2 of my top 5 came out this year with the possibility of another making the top 5 before the summer is done. I am pretty sure The Dark Knight will make the list too.