When my brother first told me about this movie, both the name and the plot made me think it was some crappy old B movie along the lines of The Giant Gila Monster. I was utterly shocked to learn that this was actually a new movie. Seriously, how can you get away with making a plot this stupid in this day and age? It's fucking retarded. Piranhas are not an interesting movie monster. All they can do is swim. And since they're not exactly stealthy killers, there is no excuse for anyone beyond the first few victims to be killed by them. So the only way people in this movie are going to die is through their own fucking stupidity, rather than the monster being interesting and clever. And that fails to interest me.
I do think it might have a "so bad it's good" quality, but I hate the idea of people getting paid to make movies like that. I don't want to give someone money for producing garbage. It's the only thing I don't care about being pirated, which I suppose is hypocritical of me since I'm opposed to piracy in all other areas. But I just hate when people get paid for making this shit.
Also those Piranhas look more like Zerg than fish.