I'm surprised you picked Victor as someone to ban out, and not Ryze, Captain of Always-Has-A-Shield-And-Infinite-Movespeed.
Anyways, my mood varies, but there's a few I always return to:
- absolutely hate this champion. almost impossible to ward against because he's jumping into your lane all the way from his fountain, and then he stuns you for about an hour - or I assume it's about an hour, as I've never actually lived through the entire thing since his full tank build does insane burst damage for some reason.
- kind of the same as Zac. She walks in, presses R, collects free kill on you. If Zac's damage is dumb, Vi's damage is triple dumb, and there's basically no counterplay to her ult. But she's ult reliant, so if I'm going to ban a jungler like this, it's probably going to be Zac.
(Honorable mention for Nocturne. I have never seen a game where a Nocturne did not get fed - a score like 10/2 seems to be pretty average or even subpar for him - but then he always seems to lose the game after, so I don't consider him a good ban.)
- absolutely hate seeing this champion on the enemy team as she's incredibly frustrating to play against. I'm not usually botlane so by the time I see her she already has her extra cheap BF Sword + Runaan's build, which is pretty much enough to three shot the AP champions I play - since I can't really build armor at all and her presence makes Zhonya's active worthless. Her traps are also incredibly frustrating if you're an assassin - if she just stands on one, you can forget about killing her since she'll just CC and instakill you by herself. Jinx is often just as insane as Caitlyn - if you get to late game you just lose if they have Jinx - but at least her traps aren't as frustrating to play against.
- I only ban them if I'm playing toplane, but I don't particularly like playing either of these champions, and those two seem to auto win against just about anyone else toplane.
- it's Blitzcrank 2.0: if her skillshot lands you die instantly, only without the Blitzcrank risk of accidentally pulling your Amumu into their team, so she can just keep fishing for days. With the added bonus of CC immune allies and a better teamfight presence. I still don't consider her overpowered, but wow is she incredibly annoying to play against.