I play all 3 classes equally. All my chars are within one LL of each other when i have max, left side gear equiped. It's only my opinion but i feel that, if you have a "main", you're doing it wrong. I like the fact that all classes have something to offer. That said, the class that has the absolute least to offer in the current pve end game is warlocks. Man, they dont offer a single thing that the other classes cant provide already in kings fall.