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I disagree. This is a movie, man. If they just cram a bunch of characters in there, there won't be much in terms of development. They need to scale it back. I think the movie was right, also, in turning Rogue from a woman, to a young woman. This made the whole Wolverine/Rogue thing seem a lot more appropriate. I think he, in the cartoons at least, treats her light a daughter/younger sister...which makes more sense with her being younger.
Actually, Rogue was a merge between Rogue and Jubilee...another change I agree with. The "actual" X-Men have too many members...WAY too many to fit into movies like this.
Oh, and I LOVED the first one. I expected lots of flaws, but I was pleasantly surprised. If you keep in mind that they had to satisfy fans of the series, as well as people with a passing knowledge of it (which is the group most likely to be in the majority here, I think), then I think you'll find that they did a good job. Lots of cool ideas throughout.