I'd say a key problem (and it was a bad movie all around) was the rather ridiculous Jean Wolverine love "thing". Let's review, shall we? In X-Men Wolverine meets Jean when he first comes to the institute. He briefly talks to her. And after that, they don't interact much if any, at least not in any significant way, until near the end. One scene. Then he leaves. He doesn't return until the beginning of the next movie. He sees a glimpse of her. They don't interact until right before the climax of the movie, which is implied to be very brief. And then she... "dies". The next time they meet, oh yeah, they're doomed lovers.