Medal of Honor Frontline - Storming the beach for the first time was simply amazing. I was just getting into the PS2 at this point and this game absolutely sold me on the next generation of gaming. Explosions, bullets whizzing by, soldiers yelling for help, this level became one of my instant favorites.
Battletoads- Great graphics, and an innovative boss fight (with a camera angle through his eyes). It even had the secret warp 10 feet from the beginning of the stage.