I hear the same crap every god damn day (you can tell this infuriates me).
This is what I think about people who think things are too OP:
DEAL WITH IT
I get so mad every time I go into the arena, an airbender rektz someone with wall damage, and the dead guy rages because of how OP wall damage is. Want to know how I never have a problem with OP? Because I always find a way to counter and or dodge it. That is the key to fully avoiding "OP". Wall damage? Not a problem. Just be faster than the Airbender and figure out his or her battle strategies and they wont be able to strike you with wall damage. Bloodbending? Not a problem. Just keep your distance and and don't let them get in complete eye contact with you. Also be fast. Lavabending? Not a problem. Lava isn't maneuverable meaning the faster you are, the harder time Lavabenders are going to have hitting you with lava.
Now, please don't respond with, (initiate noobie squeaky voice) "Oh, if you think OP isn't a problem? Go against the AvatarState and or ElementSphere you n0b." The AvatarState AND ElementSphere I have to admit are both a bit OP, but why would you even go against Avatars with that kind of power? :/