Skip Grenade spam, Skip Grenades that occasionally one-shot kill after their ridiculous homing, Revenant Supers with a blast zone that dwarfs Nova Bomb, Revenant shurikens that are aimbot knives without an exotic, Hunter shotgun synergy because of their jump and dodge, Bakris exists, etc, etc...
Just throw in Behemoth Titans or just Stasis in general with Telesto, Bastion and Felwinter's Lie on top of that and you have a sandbox that's ironically on fire.
How in the world are other things going to get buffed up to match this?
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They arent the best, just the easiest to play. Someone who thinks they are OP are bad at PvP. Obviously Warlocks are the best when played right, which is rare, but Titans are the in-between where they are the best with someone who is decent enough to not need their Hunter crutch.