Boeings build airplanes, Douglas builds character. You slow down in a Boeing to put flaps out.... you put flaps out to slow down in a Douglas.
4500hrs of MD80 time never diminished my opinion of the airplane - built like a tank, flew like one, too once you learned to finesse the flight guidance, it was actually a fun bird. It was very quiet and has lots of elbow room (compared to a 737, where the side window is right in your face.)
757/767 is a whole different world, makes it a much easier job.
3000 hrs MD80. Completely agree with this sentiment although I've never flown the 757/767.
I will say the 737-800 is the best 737 IMHO.