Hunters have wombo combo (smoke w/ vortex/voidwall Titans have burn solar grenades that do considerable damage and burn, also some would say their lightning grenades are pretty strong and reliable Warlock lastly has Firebolts and fusion sticky, but more importantly the stormcaller with arc web perk with a storm grenade selected running max discipline can throw those every 30 seconds and wipe a hole team if they are grouped up fairly easily . (Far more "OP" then Firebolts with Viking funeral )