since Koreans ban teemo a lot because he is OP in top lane
there is another cancerous champion like teemo and he is not banned as him = karma
the counter #1 to teemo + arcane rune you can't dodge that if you get hit by her q because it slows you 
there is another cancerous champion like teemo and he is not banned as him = karma
the counter #1 to teemo + arcane rune you can't dodge that if you get hit by her q because it slows you 
Is that the reason they ban him? Bans are used for a few different things after all.
if you want to play happy not tilted yes it is worth even if you lose your game at least you are not tilted AF
Not sure if it still exists, but toplane tank Karma was maybe the most cancerous thing I've ever played against. Not worth using a ban on though.
she is like teemo really annoying toplaner no one wants to lane against those champs