The X-Men movies have been somewhat hit-or-miss. X-Men, directed by Bryan Singer in 2000 was a really excellent first movie. It changed a lot of the character relationships, relative ages, and etc, but it did it in a way that was true to the heart of the original characters, and added enough novelty to make it all very interesting. The sequel, X2, directed by Bryan Singer in 2003 was a great followup. X-Men: The Last Stand in 2006 had a new director, and was a crappy story with a bajillion characters thrown in apparently for merchandising. X-Men Origins: Wolverine came out in 2009, and was almost completely worthless, other than an outstanding opening credits montage featuring Wolverine and Sabretooth fighting side by side as brothers in a couple centuries of wars.
Overall it was okay, but some of the character motivations were thin at best, there were several characters that were clearly only included so they could be part of merchandising later on. That aspect wasn’t as bad as X-Men 3 (thank God) which included dozens of characters that were only on camera for seconds, just long enough to say their name and show their powers.