I find a lot of plot inconsistencies in here.
If apocalypse is so powerful that he can change the elemental composition of all the people around ( as shown in intro scenes of apocalypse) then why cant he just do the same with the mutants standing against him in the final battle.
The second issue with this film is pacing issue. There are a lot of recruitment scenes. First Mystiqe goes around looking for mutants. Then apocalypse goes around and looks for mutants. Then professor goes around and looks for the mutants. I feel pacing of the movie could have been improved. The best part of the movie was watching the quickSilver.