I don't wanna list all, but here is my list of my favorites
1. The Dark Knight Rises (TDK is a better movie, but for me Rises is emotionally richer and therefore not only my favorite DC film, but also, tied with Taxidriver, my favorite film)
2. The Dark Knight (I don't think there is a comicbook movie better than this, when it comes to objectivity. It really is a near perfect movie and for me only a nanosecond behind Rises)
3. The Man of Steel (perfect Superman movie. The Superman movie I wanted, since I read my first comic 1990. For me, Reeve never was my Superman. Now, Cavill is.)
4. Watchmen (I don't think you could've done a better adaptation of the book and I love the book!)
5. Batman Begins (a great start for my favorite trilogy of all time, but compared to the two follow ups, a weaker film, especially in the third act)
6. V for Vendetta (also a great version of an Alan Moore classic. Still, the gap between Begins and this is a big one)
7. A Hystory of Violence (great film, great book, but again a long way behind number 6 for me)
8. Green Lantern (its not a great movie, but an ok one for me. It has a lot of flaws, like almost the whole script, but there are a lot of scenes I really like, which help me appreciate the movie.)
The Reeve Superman movies: Not in the running, since I appreciate them for what they are, but at the same time really dislike them. Fr me its too cheesy and too old school. And yes, I even felt that way way back when I saw them the first time in the early 90s. I know these are still the grail for many people and thats great but I cannot watch the, without getting bored (apart from the first hour of Superman the movie, which is a great start).
Burton Batman: Liked both when I was a child, but even then hated the fact that Batman kills and is so different from the comics. Cannot watch the, today, to be honest.
Most hated: Batman and Robin for obvious reasons and Constantine, because its a horrible adaptation of my second favorite fictional character.