Overall satisfying, but has some definite flaws.

Rating: 9/10 (24 June 2006)

To begin with, some of the characters were stunted in the way they were used, and despite the ending leaving it open for a possible sequel, I can't believe Professor X and Cyclops had to die.
According to the comics, Pheonix is NOT part of Jean Grey, but rather a cosmic force that possessed her because she was so powerful.
What happened to Juggernaut's relationship to Professor X? I don't recall even seeing them together, never mind any reference to their family bond.
Multiple Man and the kid with the anti-mutant gene were little more than plot tools, along with Angel. That annoyed me, considering that Angel was in the trailers, and he ended up being little more than a bird with a human body. Also, Multiple Man must have beaten himself silly to make himself into a crowd around Magneto, since he is supposed to copy himself only when struck.
There had better be a fourth movie, with Gambit, Apocalypse, the rest of the Four Horsemen, and a good sentinel battle. And for the love of Stan Lee, keep the characters more in character and use major characters in more than a few minor scenes (Angel)!
Props to Mystique's betrayal of Magneto after losing her mutant ability and getting throughly dissed.