Heimerdinger is just cancer early game...
Heimerdinger is SO OP early game. He just can't lose lane. He is fun to play -watching your opponent die- but unfun to play against. So here is my suggestion: Q: At spell rank 1 and 2, Heimerdinger can put down up to 2 turrets, 3 turrets for rank 3 and 4, and 4 turrets for rank 5. Turrets' damage to champion is reduced to 50% for rank 1 and 2, 75% for rank 3 and 4, and full damage for rank 5. This make his early game less cancer and give his opponent a chance to shut him down. But if Heimerdinger win his lane, he will be very strong mid game.
(She's still a viable pick against most AP Mids right now by the way)
etc, who will either kill you or force you to back whenever their cooldowns are up.