Well, about the low HP that guardians seem to have, even though Guardians are not really supposed to have the role of being a one way healing class, still got the short straw as all other healing classes in other games, which is a bit weird. But it is fair, since we already have a way to counter conditions if we trait and set up the runes right. If we were to have a gigantic HP pool then we would have been a tad overpowered.
I would also like to add that you can get your HP pool to around 21k if you trait for a bunker and ignore the healing power for the armor by going PVT, but some choose to go with high healing power and low health to have more control and more healing. I, personally, feel a bit claustrophobic when I try to ignore health and invest in healing power, so I have gone full PVT and given my weapon healing sigil stack as well as I got healing power increase in foods to get around 1k healing power. Not as much as the healing power specced Guardian, but close?
I am sitting at 21k+ HP and pretty fine with losing critical chance since I depend on my retaliation and sturdy overall damage.
It all comes to what you want to do with your guardian, really.
