They barely hurt, I've never dueled a 'pro' because there are no 'pros' at D2, just VERY good gamers.

I have yet to duel a very good hydra sorc, but i have dueled orb sorcs, which were VERY effective, and I could not see, a hydra sorc being as effective.

VS a good ama, you have to hit and run, come back, and do it again, dodging 1 hydra isnt hard, dodging 1 orb, is harder, especially when they tp on your screen and spam them coming from different angels.