It was a good movie. It's obvious you don't want to go in expecting a feasible explanation for their abilities, but they try anyway.
The only part that made me lol at impossibility was:
( This isn't a spoiler at all ):
He smacks a guy across the face with a keyboard and the camera focuses on the keys that break off, which read:
" FUCK YOU "
Where the fuck do the two u's come from?