If you will be in MK both Liberty Tree and Crystal Palace are good choices. Liberty Tree is sit down, making it more sedate than the hustle and bustle of Crystal Palace, a buffet hosted by Pooh and friends. The food is good at both.
If you will be in DHS Prime Time is a great choice.
If you are in Epcot then Via Napoli, I've heard it's great.
When picking restaurants, it's important to know where you will be that day.
You can't go wrong with any of the choices.