My take on these:
O'Hana (and LapuLapu) - You can do breakfast or dinner. Food is very good, but it can be a meat overload. I myself have never had a Lapu Lapu. Service is usually good, but I've never had anyone exceptional or memorable. Couples, they seem to want to push to get done where as a group they tend to let nest more. Characters are Lilo and Stitch, Mickey & Pluto for breakfast.
Chef Mickey - Been there, done that, don't have any plans to go back in the near future! It does have the good character potential, but not worth it to us to go back. The food is buffet food you can get at any of the other buffets. Nothing special, but you do have that chance of getting something special dropped from the heavens!
Be Our Guest - The food here is good for dinner. We have been here several times for dinner, but things can be kind of overly salty sometimes. I love the mussel's and the short rib. I do agree with other in saying the theming is what makes this restaurant more than the food. We did lunch once and was not really a fan at all. The food seemed to have been sitting around for a while, although it was delivered to our table extremely fast, (this was during the Beta Testing for the new delivery system). We may have to try it again for lunch.
Hollywood and Vine - We have never eating here yet.
Tusker House - (You can get early entrance to the park) Good buffet food, very noisy, great character interaction, "TOUR GROUPS"!!!. If you want pretty much the same food without the commotion, go to Boma.