I think all the films have some good scenes
Wolverine Origins had a fantastic opening and was descent outside of dodgy CGI claws until the 3rd act.
Last Stand had a great Magneto scenes about Ink never touching him with the Morlocks and I loved Beast.
The Wolverine was ok until Mecha Silver Samurai.
My biggest issue is their unwillingness to explore characters not named Wolverine, Charles, Magneto, and Mystique and to not pull the trigger and embrace it's a comic book movie and go full out there.