Yeah, the problem has been there since the game was started.
I think the main problem is not that the enemy does it on purpose, but that the poll can be horribly abused.
The majority of times anyone votebans someone and I actually look at the charts the player has good k:d so I guess it's just a joke or rage for being killed...
So I mostly just press the same key over and over, 2. What the banvote needs is something that automates bans for tks.