I find it difficult to list 10 superhero movies I really like... but:
1. The Dark Knight
2. Avengers Assemble
5. The Dark Knight Rises
7. Batman Returns
Nope, that's it, I can't think of any others that are actually all that good. I don't rate any of the X-Men movies, Iron Man movies or Spider-Man movies all that highly. Thor and the two Hulk ones are average. And obviously stuff like Green Lantern are weak.
As others have said though, if V For Vendetta and Kick-Ass count, then they'd go in at 2 and 6 respectively.
Do Megamind and Despicable Me count?
16/9 Richie Kotzen