I've always been partial to tank and dps, two low maintenance roles in a traditional party. Back when I played Everquest live in 2000 I had a Paladin and a Monk I'd trade off on back and forth. Though I never got to do raids it was still fun to do small pick up groups in dungeons like Crushbone or Blackburrow where I tanked on the Paladin or did assist dps on the Monk.
Not MMORPGs, but either DPS or Support, depends on which has more engaging mechanics.
Everquest's Shaman was a cool class but it was mostly supportive spells in a group but could also solo at the higher levels.