I overall liked the movie but I could have done without some of the stupid humor. I would have much rather them keep the mood dark. It was like splicing Space Balls in with Empire Strikes Back.
The P90X is fucking brutal dude. The good thing is that you will actually see results quickly, and your stamina will be off the fucking charts. The biggest piece of advice I can give you is to make sure you spend at least 30 good minutes stretching the hell out of yourself before you start the routine. It makes the stiffness much less severe.
Develop your own stretching routine, go overboard if you need to. That has always been the saving grace for any insane workout, and subracts heavily from the recovery time.