I guess you might have to be a fan of the game in order to enjoy the movie.  But I doubt that even if that were true that one could derive any enjoyment out of this piece of trash.  There is one moment of pleasure, for all you gore fans, but that is the extent.  I hated almost every moment of it.  It is not that the story so much is awful, it is the execution.  And, the acting is not all that good either.  Don't waste your time on this one.