Yeah, he does scale well into late game although in this meta the late game doesn't happen near as often but he gets crazy if people feed him. I will ban him sometimes, but usually if someone else is Mid lane and they asked for it.
I also hate having him on my team usually. Usually just a feed fest.
Camille though can be dangerous but only if you don't know her kit. She has these huge 20 second weakness windows and requires her passive proc as well as landing her tiny stun skillshot (tiny as in not wide, it is quite long next to champions). Her winrate right now is only 50% top lane and less than 50% jungle.
I can see many reason for banning Zac as well though, he is like Camille only he isn't a squishbag, he can still hard CC from forever away and while he does less damage his engage is far superior.
I have been prioritizing bans of different people but I guess lately the highest bans from me are against Rengar and Hecarim. Rengar due to his dominance, especially with a tank build and Hecarim is hard for most people to handle. He can engage so often and can move across the map so fast. The type of jungler that makes my ally laners start to tilt ya know?