This issue is in every MMO of it's type. The answer is, if you don't feel you are good enough to move out of the fire and such, then maybe you should play a class more suited to your abilities.
I know it sounds harsh, but it is in fact the truth.
That's what im arguing against tho. It wasnt as extreme in every other MMO. WoW had this problem initially, but they alleviated it by smart encounter design and changing the classes up. It is not only a problem of avoiding damage too, but more importatnly that melee DPS on mentioned fights is CONSIDERABLY lower.