I own a DVD copy of it. It has been pretty controversial. It's based on a tract written by fundamentalist Christian Jack Chick, that was released back in the mid 1980s. The biggest reason that it's so controversial is that they played it completely straight, in making the movie. It's effectively written in Chick's voice. If you're Chick, or one of similar mind, then you could easily see him doing a speaking tour on the back of the movie. If you're a gamer then you're quite likely to roll your eyes or even chuckle at the over-the-top nature of it. Apparently when first screened, in front of a con crowd, they were laughing out loud.
In short your own views will inform your opinion of it. I enjoyed it and laughed my arse off.