For action which is based on TOTAL skill, INTENSE fun and EXTREME BRAGGING RIGHTS for the winner:

Street Fighter 2: Turbo

Ken vs Ryu, ultimate showdown EVER (although my money is on Ken, especially becuase im always Ken :S )

Best game just for design and simplicity, probably chess or Reversi (Or Othello, as my version of the boardgame is called)

Best PC game... I dunno. Freelancer, for multiplayer. I owe a tiny, TINY part of my life to Freelancer. Yes it really was that fun and involving.