it's not that bad. I mean, sure it's a C-Rated movie but that's on an A to F scale after all
As far as video-games-to-movies go...it lost everything about the games that was good...but as long as you don't compare it to the source material it's not a complete waste of time to watch it in my opinion ^^
So yeah, it's a C or B-, but that's still a pass in my eyes ;D