Lets talk about Heimerdinger.

Warning : Incoming opinion! BEWARE!

First off, it's pretty much impossible to lane against Heimerdinger due to him just being able to put down his turrets where ever he pleases, which do continuous, ludicrous amounts of AP damage AND slow you in the process so it can land more continuous damage while he just gets to farm freely only to buy more ability power to power his turrets. Try and stop him from farming? Turrets say nope, and you get caught in the slowing, continuous damage and he stuns you and kills you on the spot, and if HE doesn't, then his turrets certainly will. It makes farming for the opponent pretty much impossible. I don't think an AP mage should be able to do THAT much rapid damage with little to no effort whatsoever. His turrets are already enough, but do they have to slow you as well? Plus his passive gives his turrets health regeneration. And then in teamfights he can just place his turrets down and get triple kills and quadra kills all over the place.

Opinions please, and don't be biased just because you happen to main Heim or whatever.