absolutely true, plus we got introduced to Chris and Snoop that season as well. I think season 4 also really showed the hopelessness of Baltimore clearer than any other season.
we finally see what happens with Carcetti when he takes control. Nothing changes he is forced to eat the same shit that Royce had to eat before him. We also see where Omar, Avon, and Bubbles come from with the kids story. That story line really got to me.