I've gotten to the point with my Guardian tank where I don't really have problems with AoE or single-target threat (which is what people complain about the most). And our mitigation is fine.
The only gripe I have is that we have no offensive pull. Instead we get a push. Whoop de doo. So many times I have been tanking mobs and thought, "If only this mob was much, much farther away from me!"