My favorite is probably the Gundam Battle series of 2D fighting games. They are built on huge multi-jointed sprites and you don't have to be a fan of fighters or Gundam to appreciate how good the games look. There are six games in the series with the best one (probably) being the US release called Gundam Battle Assault 2.
Macross: Do You Remember Love is a good port of the Saturn game. In the Hunt is actually better on PS than Saturn.
Then of course you have Symphony of the Night and Megaman 8, which are very good. Gunner's Heaven is...a bit to simplistic, but it's cool. Rakugaki Showtime is a 2.5D multiplayer fighter that is pretty awesome. There are a few Capcom and SNK games that actually didn't get raped too badly when ported to the PS, Street Fighter Zero 3, Pocket Fighter, Puzzle Fighter Metal Slug X...and KOF 95, which wasn't too bad.