Ninja, way better than every other class.

[Callinon]

Would anyone play it if it wasn't op. This reminds me of a moba game and them nerfing new champions 1~2 month after coming out.

It wasn't really op at the time, it just looked like it was.

Poisons giving 20% damage? Doesn't matter because the damage numbers were balanced around that existing.
TP costs low? Yeah they were a little low, but the adjustment brought them pretty much in line and it wasn't a huge adjustment
Damage? I believe Aeolian Edge got a 5% nerf a little time after release. So one ability was very slightly too strong. So OP!

The attraction for me was the ninjutsu requiring individual mudra input. I thought they could do some cool stuff with a system like that, and so far they have (though they could do more).