"Features excessive violence, an incoherent plot and inane dialogue." (Consensus about this movie)
"It might just be one of the best videogame adaptations ever made, which isn't saying much." (Part of an anonymous review)
You MIGHT enjoy the movie, if you casually played the game(s) or just lack any sense for good movies (no offence). But if you either really loved the game-series or have never even heard of it - better spare yourself the disappointment.
Yes, it might be the best adaption of a videogame (I don't know because I have only watched about 2 of them) and the whole atmosphere really fits the games and yes, they did take the soundtrack of the game, so this is really an asset as well...
BUT! This can't belie the fact that the whole story arc is as holey as Swiss Cheese and if you haven't played the game(s), you'll probably sit in there for the first 30 minutes, just trying to figure out, what the deuce is going on there and why the hell noone notices the guy with the bar code on his rear head.
So my advice: Only watch this movie, if there is really, REALLY nothing else to do (and washing the roof of your house in the midst of winter is counting here!)