These are just my thoughts on why X-Men 3 will suck big ones...
1.
This is the title of the movie?? X-Men is a forever growing and expanding community of comics. To say that something is their last, is a bit extreme. There have only been about 15f the X-Men library introduced as "human" characters alone. None of which I might add are distinquishible except by name becasue of their costumes...
2.As much as I hate this fool playing Cyclops:

Yeah he dies.... Sorry for all of you that can't get that in the trailer, but it's pretty obvious since he isn't in the rest of it.
3.This shot of Rebecca Romijn was actually aloud in the movie.

This shot reminds me of an outtake where she should have a serious face on and decided to crack the staff up and have a goofy ass smirk on her face instead... someone needs to re-do their FinalCut tutorials. (That's a video editing program for all that didn't know... :)
4.
That's Juggernaut from the movie...

Yeah... this is Juggernaut from the comics...