Just rewatched the trilogy (well I'm halfway through X3)
X1 is decent enough on it's own, I don't feel like it's aged very well, but it's still an enjoyable flick.
X2 is just leagues above the first movie, and aside from a few cheesy moments, is a great film. Brian Cox is an absolutely fantastic pick for Stryker, loved every second he was on screen. The character interactions are great, but I could go without the whole rogue/bobby relationship sideplot. Action sequences are fantastic, and aside from some goofy wirework from time to time, the film still holds up. I was really able to appreciate the nightcrawler intro far more than I was kid, just really well done and tense all around.
X3... What the fuck happened to all the characters. I feel like most of them behave so much differently than the previous films. It's hard to explain exactly what I mean, but maybe it's the mediocre dialogue that makes me think that. Definitely has some great action scenes though. The danger room sequence, Jean in her old house, and the golden gate bridge/all out war come to mind.
After reconsidering, X2 may be my favorite over First Class, they both seem to outclass the rest of the main movies considerably. Also, I feel like the films really destroyed Cyclops, using him as a side character rather than the badass team leader I was accustomed to from the 90's cartoon. And those leather suits, jesus...
X2>First Class>The Wolverine>X1>X3>>>Wolverine Origins