Amazing, even for non FFVII fans.
I rented the movie just because it looked interesting and it was based on a videogame. After watching it about 3 times since i can honestly say it is the best videogame movie to date. It has amazing CG graphics that almost make everything look totally real, but at the same time the special effects don't stand out as fake like they do with modern day flicks that contain bits of CG graphics. This combines for some really breathtaking battles, and since the movie is almost non-stop action, it really makes for an amazing movie.
The sounds are also incredible. I have read many posts saying that the English version had worse voice acting, and that is totally untrue. The voices are perfect and unique to each character in the game, and even adds additional life to the movie.
In closing you should buy this movie hands down. It is amazing, for FF freaks and people who have never even heard of the game(unlikely). I would recommend buying it immediatley, or at the very least renting it.