Professions in GW2 are separated by both HP and Armor classes. That has made GW2 very hard to balance properly. The difference between Light and Heavy armors is huge. The difference between 19k HP and 11k HP is even bigger.
Current Total Health at level 80
Warrior, Necromancer / 19,212
Revenant, Engineer, Ranger, Mesmer / 15,922
Guardian, Thief, Elementalist / 11,645
Suggest total health at level 80: everyone 15,922 HP
This would help balancing immensely, and every classes have enough HP buffer to handle the 10k+ burst.