I would agree that it's more difficult to solo as a tank but if you have a guild there should be plenty of people willing to do runs with you, regardless of your class. If not, you may need to think about finding a new guild. I had no issues whatsoever reaching plat with my warrior.

And the spikes are going to 1-hit kill you no matter what if you get hit by them. Bulwark, arcance ring, mythic armor, with a protection elixer still wont save you.