One of my best friends introduced me to DBZ: BT 2 first. I was immediately hooked. Being a fan of the anime, having a fighting game that properly emulates fighting in the series was a dream come true! Played the heck out of 2... right until I learned that there's 3. And the rest is history.
Dragonball Z: Budokai Tenkaichi 3 is probably my single most played PS2 game ever. It is a phenomenal fighter, and one that should be preserved for future generations to experience!