Oh btw, what's your take on this...(which I posted in another thread)?
http://www.superherohype.com/forums/showpost.php?p=9208982&postcount=128
...I don't think Jean's stepping out of the jet to create that wall against the rampaging waters was a haphazard way of ending the movie.
It must be recalled that aside from the occasional emergence of the "Phoenix", Jean did not really feel that confident about her powers, which meant that by and large, she wasn't able to wield her telekinesis and telepathy to their fullest potentials--as strong and as far reaching as they were supposed to be.
Perhaps to her mind (which was already starting to get pretty conflicted at that point), she felt that she had to get out of the jet and lock her teammates in to ensure their safety (and from possibly meddling with her plan) so that she could have a clear view of the lake as well as the jet, which she needed to concentrate on if she were to successfully lift the jet, fix its mechanical damages before the body of water totally comes down on it. Perhaps at that point, Jean, with her limited knowledge about her vast potentials, still wasn't adept with the art of creative visualization, which she could've used to move anything from even the most remote parts of the world with just a thought.
The only question I have is why she allowed herself to drown after successfully accomplishing her near-term objective. (This could've been explained in X3 if Ratner and his team were only faithful to the first 2 films.) One could surmise that maybe because of her emotional state--one where she felt being overcome by something so powerful and uncontrollable, she might have felt deep within her that it was her time to go for the good of everyone.
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AND this...
http://www.superherohype.com/forums/showpost.php?p=9209010&postcount=129
Now that I thought about it, it seems pretty inconsistent for Prof. X to tell everyone how he pitied Jean for being shy about her powers when in X3 he revealed that he was central to Jean's inferiority complex in the first place.
The writers in X3 might have missed this detail in X2, lest they were trying to intentionally paint Xavier as a grade-A hypocrite.