I think all pawers are really good depending on which map and what pawers you select. Afk is super good for maps like ichiban and typhoon, but really bad on conveyor or ring of Garfat.
Why is Gatling so low tiered? It's so strong because no one can touch you. On broken arrow, castleween, and even conveyor, I push players back so far. Please give it a more of a try lol
But let's all agree that berserker is not good unless it's broken arrow. You're not really buffed since I believe that got nerfed, but have knocking people out to increase time. Doesn't help very much tho