yeti consume, 1 hits a turret
smite cuts off 50% (applicable if you have a jungler)
morgana tormented soil approx 50% to all turrets under it
veigar dark matter damage up to 1 hitting turrets (extreme late game)
malphite can ult groundslam that team camping turrets to take out turrets along with enemies
a semi-farmed amumu will burn them down with tantrum easy
corki can shoot a few missles and a phosphorous to take out groups of turrets

seriously people hes NOT THAT HARD TO COUNTER. dont just leave your two melee heros against him, swap lanes, it works.

I think that the magic resist on them is too high (lol@popping Sion's shield with 100AP at level 5 for 100 damage D and I noticed they regenerate. Toning down the magic resist and removing regen from the turrets would make it less of a pain in the ass; running in, blowing shield, watching it do no damage, then having it regenerated by the time I have a shield again is -_-

If you played against a Heimer, as a Heimer, there should have been no turret issues. You just gotta keep chucking your grenades and they'll be destroyed in no time.

btw, do heimer's turrets detect stealth?.. ^_^

The MR is too high and the AP scaling is too good. The AP ratio is currently 1:4 which means he can surpass a 1:1 ration with 6 turrets stacking. This results in some high damage. The MR is far too high and thus prevents the squishy casters from viably countering the turrets.

I think the turrets have way too much health and protection. They really should have maybe half the HP along with half or no armor and MR at all.