Avoid like the plague.
The graphics? They suck., and not just because it's old. That would be excusable. These graphics are just plain terrible. You shoot squares. yes, SQUARES. The sound is mediocre too.
However, despite how bad it looks, sounds, and handles, the game play is alright. Just don't be fooled by the opening video. It's not as hardcore as it seems. :P
All in all, I wouldn't pay more than $5 without feeling ripped off.