We had dinner there on our last visit, and were a little disappointed. The serving line wasn't kept clean, and there was food all over the place, some of it dried and very unappealing. There was also a good deal of food slopped on the floor, which we felt was not typical of a Disney restaurant. The quality of the food was not spectacular--typical buffet stuff.
That being said, we still had a great time! If one wants good food there are plenty of better options than Chef Mickeys, but for a good time with our favorite characters, you can't beat it!