They are all OP. As a warlock, I find the hunter and titan to be overpowered, but at the same time, I get pissed off at warlocks because of the abilities they use against me.
Think about it
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If a weapon can not kill you in 1 shot in the foot it's not op and if it's not op it needs to be buffed. With the exception of rockets if you can see the rocket blast you should be killed instantly doesn't matter if your across the map you see it you die.