I don't mind seeing a lot of Zed to be honest. Most of the people im playing against aren't mechanically skilled enough to really do well with him, and I know I can contain him in mid lane by not feeding him myself and always making sure my teammates know when he roams.
The thing I do find really annoying about him though is his ability to perform well even when behind and his ability to 180 a lane even pre-6. Ive had instances where im punishing him hard, force him to use all his pots and sit around 50%, farming with Q and whatnot, but all it takes for him to turn that scenario around is one single "all-in". One single full combo from him and all of a sudden that lane ive been dominating for 10 minutes gets turned around and im on my back foot. Add to that the fact that its pretty much impossible to really stop him from farming, and you've got a supremely annoying champion to have to play against.
But like I said, im not playing against pros at my elo, so its not really a big deal to me. Just bring barrier or exhaust and play Farmville.