Counter attacking/dodging while stunned

It never has made sense that an enemy that is "unable to take any action" can do backflips around your attacks or counter attack while stunned. Fear and confusion should cause some rounds to have no dodges or counters also

Agreed. Far as I can tell, there's seems to be no advantage to casting Stun instead of hold. And Frankly, little advantage to Hold instead of fear. In some cases (particularly if you don't have 3sq hit) fear is probably far better. Hybrids, or hitters with some Dex, can easily chase around a feared mob and land hits, and they won't return fire.

I think hold is supposed to basically the same as stun, except only for NPCs