And though I'm "defending" third-person, I should make it clear that I personally dislike writing
first-person, not reading it!
Case in point: I really enjoyed Dan Wells' I Am Not a Serial Killer
and its sequels, which (as the title implies) are written in first-person from the POV of a teenage boy who is trying very hard not
to become a serial killer--despite definite tendencies in that direction. Since the books are, to a large part, all about him wrestling with his own inner demons, it makes sense that you would want to be inside his head the whole book--since that's where most of the conflict is!