I believe warrior is weak if they are not fully gear. In order for this problem to resolve they should up warrior armor so that they can tank better.

Without decent gear warrior is so weak and tear like a paper.

Btw don't blame everything on warrior, Mage an rouge have their own problem.

Mages fireball wrongly and rouge pierce everywhere.

I can understand what you feel as I have a rouge myself. 95% my rouge tank. I don't complain cause I know the class difficulty ok warrior.

My advice is play better and you will be good. Don't be greedy and spam pots.