Recently people are getting this wrong idea about mmo's, they aren't about getting virtual items that really doesn't matter, they are about having fun, you didn't get that item, so what you will get it next time, for me if i get a good talk with my friends in game it is 100% more interesting then getting some virtual item.
Second you must be open minded because if you played mmo's in the best aka i mean this everquest style of gameplay, you must throw it away since gw 2 is totally different.
You cannot get instant heal from 1 to 100% of health, every dungeons can be done by a full group of dps, if they know what to do. Of course with tank and healer it is easier but it is totally doable with all of you being dps. Tank in guild wars 2 is more for preventing damage then taking all the damage as in wow.