Warlocks are easily the best class for Crucible; Sunsingers have self-res for surprise attacks, scorch is a one-hit during radiance gives you a shield for hits (not kills like Force Barrier) and has the highest attack radius of any melee, fusion grenade is by far the easiest sticky grenade to land in the game, and burn gives all their abilities DoT. People who say Warlocks are weak in PvP are clearly bad at using warlocks...