I like those builds but I think they are so effective mainly because of Glass Cannon. I think this talent should be a bit more toned down, the way it works now is too much benefit for too small a disadvantage. -50% hitpoints are a big disadvantage, if only your character didn't have a ton of them to begin with. I mean you keep the Cannon and drop the Glass.
It is however a single player game, and I think the awesomeness factor of the character is more important than fine balance in the end.
