In my opinion, A great healer is the second most important class in a raiding party next to a tank. Anyone else in a raiding party can fall but if any one of those 2 go, it's usually game over. The only time I can remember beating a high level dungeon in Eden Eternal as a tank with my whole party wiped half way through, running out of healing items just before the healer died. I'm how I managed to pull that off because when I had to fight two bosses at once and some minions. I think I might call that my greatest accomplishment in gaming. After that, for weeks, every time I logged on, I was getting all kinds of random dungeon request because every one on the server knew about it.