I'll keep this simple and I won't give out any spoilers. I, personally, hated this film. Yes, I was a comic-geek back in my day, but the deviation from the comics is not the reason for my ire and in fact, I enjoyed not knowing what was going to happen next. No, what I had a problem with was the way this film butchers the storyline established in the first two movies. The heart is gone; replaced by computer generated graphics and big, loud noises.
If you are the type of person who enjoys watching big explosions instead of identifying with the characters; if you are the type of person who cares more about quantity than quality; if you are the type of person who does not care about the true storyline (a persecuted minority fighting for the right to exist in a world that hates and fears them) and just want to see some freaky people zap things; then this movie is for you. Stop reading this review and buy it right now, because I guarantee you will love it!
BUT, if you are the type of person who was looking forward to an emotionally AND visually pleasing end to this trilogy, prepare to be heart-broken. The rich storyline and subplots are basically used as "asides" to break up the 20-min long special effect scenes. The dialogue is shallow and superficial and unworthy of the X-Men title. In fact, this movie could have been a stand-alone... But I digress. I will not buy this movie. As far as I'm concerned, it never happened. I'll keep my collectors edition of 1 & 2, and avoid 3 like the plague.