Though you will find mixed reviews on this one, we really enjoyed the Sci-Fi Dine in Theatre. I didn't think the food was bad at all, and the shakes are wonderful! The atmosphere is enough to go and enjoy!
We also enjoyed Hollywood and Vine - the buffet was great, and DH loved it, and he is not a big buffet eater.
I have heard a lot of wonderful things about 50's Prime Time Cafe, and it is on our must do list for our next trip!