Their AI sucks too much to nerf them. They only hit moving targets if they walk on a steep angle in to them. If their AI got under control I'd probably agree with doing something to them, but we're not there yet.

I didn't get that feeling of almightyness against towers. Maybe on isolated ones, but they tend to die in number with splach damage. I admit I almost nether do anything to boost their damage, since as HD300 stated it, AI makes minions uneffective against DG. They are my own weapon boosting reserve

There's something more important than towers with this, and that's the Citadel.  Ever see how fast one goes down to Spirits fully upgraded with Morale?  And with how mobs/creeps congregate at a Citadel, it's like an unlimited supply of them.

I still think they're too powerful as is, I notice my friends have a very, very hard time holding ground at a flag when I move in with Oak and his entourage.