I am 35 on my trooper at this time and am playing the level 35 version of the build. It seems like it is reasonably hard for one person to kill me but I get absolutely decimated if I become a popular target (3 people will kill me in a few cooldowns), which I often do since I'm in melee range and jumping into back lines and such.
At one point in the video you show some impressive durability, near the end. I wonder if it isn't as much gear imbalance as anything or that a combat log would give some interesting information, if one existed.
Agian, it is the warhammer memories that fuel my annoyance. I find it frustrating that dps can pick me as a target in a care free manner.