A tank's lament

[Terkhev]

I've never seen tank kicked for low dps tbh, and trust me, I ran with some extreme cases. If you are kicked in non-savage content, there probably is other reason for that.

Report them and they will get banned for it.
You cant even mention the bad dps, because that is looked by gm's as a parser harassment, it gets more attention than bots. Let these red heated brains use a break from the game.

It's not how it works. They can get warning or maybe even ban for insult, but that's it. You don't need exact numbers to see when someone is doing wrong rotation or not using all his skills. For all we know they might've just told him to use DPS combo instead of enmity one or stop sitting in tank stance.
Also, you can talk about bad DPS all you want. It's obvious when mobs die slower than usual and you are free to point it out in chat, as long as you don't insult others by doing it.