Personally I'd say titans since they always bitch about how they're the most important.
<EDIT> to every titan who immediately hit hunters, you make me laugh.
<EDIT 2> I would like to clarify this is a question about forum presence, not lore. Lore wise it's conclusive that hunters sre the most prideful. It's your opinion on forums I'd like to know.
<EDIT 3> Holy shit!! 700+ replies and to top it off we're trending! Guess all you need to get fame is some good old fashion jimmy rustling.
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Id also say titans. The main hunter gripe is no overshield during a super cast and or in ability to reuse super if killed mid animation. The reanimation one I agree with overshield not entirely although gunslinger could use a slight bump or something at least to not be a one shot kill at full health. But yeah the warlocks never seem to whine since they have the ram and extra shielding but the titan complaints have ranged from needing blink to increasing melee distance even though they have shoulder charge but idk. I deleted my titan, I just prefer hunter. Although I don't agree with fists of havoc hitting people up a good distance in the air I'd like to see a lightning bolt or something come up similar with arc bolt grenades. Just throwing it out there.