From my experience on the NG the autopilot is great in calm conditions, but throw in some wind and it doesn't handle it to well. I have had two instances in two years where the autopilot had to be disconnect because it could not fly the approach within tolerance in the conditions yet the pilot takes over and flies better. I would suggest that asides from fog a good pilot with some time on type flies better than the autopilot as he can anticipate, where as the autopilot is reactionary.
A pilot can land in a 40 knot crosswind comfortably whereas the auto land cannot. So while autoland is great in fog it isn't practical for everyday operations.