I think the Nolan Batman reboot is comfortably one of the best just because it doesn't ignore the darker, more mature nature of the comics and try and make it a film for the entire family. X-men should have been so good, and they were so average
The entire X-men films were sort of ruined for me by what they did to Rogue. Just destroyed her character. They were alright, just not as good as I'd hoped considering the comics and even the cartoon