As a hunter main, I think shade step is op. However, I've played my fair share of warlock and I can say with experience that sunsinger takes absolutely no skill. It's so easy mode. I think shadestep needs a longer cooldown and probably get rid of the ability to dodge grenades, but tether kind of sucks and wombo combo exhausts your melee and grenade. Without smokes and shadestep, the class is shit. Sunsinger, however, has good grenades, shotgun melee, flame shield, the 8 year DoT, the ability to self revive, and a super that abuses all of these things. Say what you want, but there's no defending sunsinger imo.