Our Favorite: The Tusker House in Animal Kingdom.
Thanks to the lovely French lady in guest relations in DHS who recommended it! We loved it. Why:
1) It was not crowded at all (couldn't even get reservations in Tony's; Le Cellier; ok could not get reservations ANYWHERE), and it is awesome.
2) Awesome selection and Buffet means eat as much as you want.
3) The best and most diverse of the food I've seen at any restaurant.
4) Incredibly friendly staff (probably due to #1 above)
The only down side was there were so many good foods, that the buffet style makes you want to eat EVERYTHING and then you either spend too long there or you are too stuffed to do anything afterwards.
SO, I would love to hear some other people's opinions as to the best and/or most overlooked Disney Restaurant - as I've never been to so many!