Re: Fox Offers Matthew Vaughan "X-Men The First Class"!
Vaughan left X3 because the script was shit (in his opinion). That's the story I heard anyways. "shit" is my own exaggeration, but if you read between the lines of his comments about how he didn't feel right about the script, that's kind of what he's saying.
The story I recall is that he dropped out because there had been a death in his family.
Kegg: "You're a Trekkie. The capacity to quibble over the minutiae of space opera films is your birthright."