My 15 year-old neighborhood has still not been assigned a "regular" mail carrier by our local Postmaster. I never know what will happen on any given day. When they are good, they are really good. When they are bad, their lack of process discipline (axememan's example for instance), customer service (never answer the phone at the local PO), and lack of accountability can darn well make resolution near impossible. Best to expect the worst and be pleasantly surprised when they don't screw it up.
Dave
Dave