38. Mario Power Tennis: Nintendo/Camelot, GameCube, 2004
It iterated on another of my top games, Mario Tennis, but was not quite as memorable simply because it came second, although the gameplay had more gimmicks. The problem with said gimmicks was that the Defensive moves were unbeatable, making higher-level play against CPUs into a chore (you HAD to be sure they didn't have a Power move, or you wouldn't get one past them, period).
Monster Hunter: pissing me off since 2010.