What we have learned from Worlds so far
Most banned champion at 45 games. 100% win rate at 4-0. Needs more nerfs.
Had 1 less ban than GP. 100% win rate at 4-0. Stupidly broken right now. Needs reworked.
29 bans, 16 picks, went 8-8. 50% win rate when played by teams that aren't even the best on her. Probably needs nerfing.
22 bans, 11 picks, 73% win rate. Still way too strong, needs nerfs/rework.
Was pick/ban. 17 bans, 30 picks (tied for 1st), 63% win rate. Needs more nerfs.
16 bans, 18 picks, went 9-9. Still very strong.
14 bans, 20 picks, 40% win rate. Surprised by this one. She looks like she is pretty close to balanced now.
12 bans, 10 picks, 70% win rate. Very strong, needs a nerf since he was banned away from the best TF players.
11 bans, 30 picks, 57% win rate. High win rate even with teams building against him. Definitely needs nerfing.
9 bans, 14 picks, went 7-7. Still as strong as ever.
8 bans, 5 picks, lost 1 game. Players are discovering how OP he is. Definitely needs nerfs.
7 bans, 4 picks, won 1 game. As expected, Veigar is fine, no changes needed.
6 bans, 21 picks, 52% win rate. Still very strong as always.
4 bans, 20 picks, 45% win rate. Strong but pretty balanced it seems.
3 bans, 6 picks, 67% win rate. OP as always when smart picked.
1 ban, 20 picks, 60% win rate. OP as always. Needs actual nerfs.
1 ban, 11 picks, 64% win rate. Super strong in teamfights due to the AoE stun. Probably needs a nerf.
1 ban, 5 picks, 100% win rate. Very strong. Looks like he may have been overbuffed.
All other champs were either played to little to be able to draw anything from it or their numbers were pretty normal. I was surprised that Tristana and Vayne had low win rates.