1. Batman Begins
2. X2
3. Spiderman 2
4. Batman Returns
5. Superman 2 (dammit, that movie's too favre to hate on)

I just got back form Iron Man, so I still need to consider whether or not it is top 5 material. If this were a top 10 list, I may seriously consider Ang Lee's Hulk (but I go really back and forth on that one.)