To tell you the truth, I liked X-Men, but mostly for Jackman's interpretation of Wolverine. A lot of the other characters didn't sit quite right with me. McKellen as Magneto, even though I don't believe he looked right, worked enough for me. Cyclops was pretty dead on, but did they have to make him a full-on jerk? Can't they let us decide whether we're gonna like him or not? Rogue was all wrong to my mind - where's that hot, bubbly Southern girl I know and love? Those were my main beefs, aside from Sabretooth being a disposable sidetrack (give us a real Wolverine/Sabretooth conflict sub-story).
X-2 bored me, it really did. I fell asleep in the middle of it the last time I saw it. It just had no depth. A lot of people probably disagree with me, but that's what I felt.
I still want X-3 and Superman Returns to be awesome, but I have my doubts about Returns. Why couldn't they have started again and instead try to evoke the spirit of the Donner iterations?