Based on Akira Toriyama's insanely popular anime series, DBZ is an awful game that exists solely to make money off fans of the anime. Just how bad is it? It's so bad that my girlfriend's ten-year-old son, a huge Dragon Ball Z fan, spent 15 minutes playing it before putting it down in frustration. Fortunately for him, he didn't have to play through the whole game and write a review…