No class is OP. They're all equally good in every form of the game, besides Hunters in PvE. PVP Hunter -> Blade dancer has high killing potential and great for clearing flag areas in control or winning momentum back with Arc Blade/Golden Gun (the killing potential). However, very slow recovery rate hinders it in extended gun fights. Warlock -> Honestly, in terms of support ability and killing potential, the Warlock is by far the most versatile class. Nova bomb is a down right nuke and is essentially a get out free card when you activate it. Radiance itself is very good too. Not only do you become a walking grenadier spamming the best grenades in the game AND having lots of damage reduction, your melee adds on to it whenever you melee someone you get a shield (should you build it this way) and you can get all of this and more by self reviving yourself. Amazing class overall. Titan -> Striker is an overall melee class and it's Super is similar to Nova Bomb in that it has a lot of killing potential with AoE damage and the damage reduction you get when casting it. Defender is amazing and not many people give it credit. You essentially guarantee flag captures and if you're using a shotgun, anybody who dares coming in to your bubble is getting melee'd or one shotted by your shotgun. Another versatile class. All the classes are good and serve their niches (Defender Titans and Sunsinger Warlocks especially in PvE).