We have only been to Chef Mickeys for breakfast. Its decent. Would I go if there were no characters, no. The food (for breakfast) is much better at Bome, 1900 Park Fare or Crystal Palace for buffet, and a la cart I prefer any place! Its probably at the bottom of the breakfast list, only slightly above Tusker House IMO. But, thats not saying is disgusting...just average, but the characters make it special.
We've done Ohana for breakfast and dinner many times. Personally, I like Epcot restaurants over the dinner, though my husband is a big meat eater and enjoys the all upu care to eat here. My kids have fun playing limbo and coconut races and, though I do not like bananas and wont even try it, I already read rave reviews about the dessert. Again...its OK..even better than OK, but not GREAT. I would choose Via Napol8i, Les Chefs de France or San Angel Inn any day over Ohana. If you are planning to be at the MK, its a great place for breakfast or dinner, away from the crowds and the monorail ride is fun too.
And thats my honest opinion!!!