I once made a post that said "Ban Vayne". It was downvoted
Now i see threads saying the same thing and they get upvoted lmao. Aside from that irony, Vayne is very powerful in solo q right now. Jinx is also very strong. However, Vayne is easily a very powerful duelist...So when I am first pick I always ban Vayne because regardless of my own skill in dealing with her, I see good vaynes scale hard off a kill and then proceed to be a HUGE threat throughout the game by mercing the team if they fail to hard cc her or assassinate her.
Ban vayne for better ranked games :P. You also don't want to see Sated Devourer Vayne.