Burning damage needs big nerf since it scales so much with condition damage stat. For short duration, big damage is done. Burning in PvP is fine if it is the only condition(easy to cleanse), but problems happen when classes that cause burning like guardian apply multiple conditions. So not just even if you cleanse its stacks but new 10 comes right after that. Even as renegade(class that reduces condition damage but also rev that doesn't have good condition cleanses) i couldn't tank burning.
So i propose some big nerfs to guardian might(boon) sources, condition damage stats, their burning stacks from weapons and other effects like spining sword on the ground etc.
This is unhealthy for game, to have a guard that does 5k+ burning damage per second. Literally playing pve dps in pvp.
Hope arenanet devs will reconsider guardian for next balance patch. They did good job for nerfing mesmer, thieves, revs, now it is time to nerf guardians too.