Hunter. I'd always looked at it askance as too simple... but it's simple in concept and less simple in execution, like tetris. Easy to do decently, hard to do perfectly. So many of the skills have asymmetric and even shifting cooldowns (upshot, HS) or soft cooldowns (barbed arrow, pen shot. I.e., used as needed not spammed) on top of the resource management minigame. A lot of dynamic thinking involved. Contrasts with the warden, which is nose-to-the-grind intense memory-based gameplay when actually dpsing; but you dont really work the part of your brain that has to juggle priorities on the fly. That comes in behind the scenes on the training dummy, working out a new rotation.