@Moosader Good times from Taito Fighters' Impact and Data East's Side Pocket 3 / 3D.
First one, together with Tekken, was the only fighter game to have human-perceptible time to respond, but Taito's was the only one that had a combo system preventing button mashing (faint if knocked out).
Side Pocket 3D was the only one to allow free advanced billard skills from the beginning (I suck at real game, though).