Least favorites:
Ohana (they overcook their food so much I might as well chew on my shoe)
BoatWright's (food is meh and restaurant is way too loud)
The Concourse Steakhouse used to be my favorite by a mile but it is long gone.
Kona still serves a half-way decent breakfast if you go mid-morning otherwise you will probably get lousy service.
All in all I have never been a big fan of Disney breakfast options. Whoever taught the cooks at the Whispering Canyon how to make gravy should be shot.