Absorbtion rating and defense is key...have a 50 guardian thats pretty hard to take down due to that... I also do agree with the whole knock back/stun during PVE they should do something about that...I also worked with my 50 assasin and made him into a tank, and I still get the same results. But in conclusion, i do 100% agree with you that they need to make a couple changes during pve with tanks...maybe two more abilities that can break stun and reduce the chance of knockback.