The dwarf turret has 100% accuracy, wallhack, too much HP, superior range, DPS and can be repaired...
Im fine with simetra turrets as they are more like a point defence of small area, but the dwarfturret is simply a bit too much.
I would see the hero gone completely, but thats a bit too much to ask as he is having a bit of fanbase i think... so Wouldnt be better to nerf the accuracy and target aquire time a bit. If I play FPS I prefer to be murdered by real players, not AI controlled contraptions that has no place in this genre.