There are currently 4 champions with a 45%+ Ban Rate
According to championgg
Sure, I'm beating a dead horse, but I really don't care.
In theory, the idea of bans is to ban champions that would counter the team comp you are attempting to put together. League is a team game, we all understand that, and it's something riot has stressed very much so.
We are essentially at a point where you MUST ban Zed, Ekko, Kindred, Nidalee, Malz, Maokai, Fizz. Not because they would endanger your team comp, or counter you etc. but because they are so unbelievably powerful that regardless of what they're being played into they still bring tremendous power, advantages, and relevance to a game.
Even if you have a bad score, even if you get absolutely smoked in the laneing phase, it doesn't matter, if your team can hold out and extend the game most of the champions mentioned above few not mentioned as well still provide such a powerful advantage to your team that it's absurd. 
Welcome to the top lane.
10 bans or bust.
Has crappy team fight but good early clear so only ban her if your comp cannot survive the early game
Is not that bad just his slows are overbearing when played as a tank and as a assassin he actually has slower and lower burst than most others
is wayyyy overrated cool trick if you kill his voildling right when it spawns he has much lower DPS if you cant do that just wait it out the CD is rather long
is easy to counter if your tanks focus him he cant risk trying to burst them
Nothing about her is really that op just another ADC at the end of the day
a good tank but not like he is going to kill your whole team if you focus him last
