I liked Crystal Palace. The buffet was pretty decent. I'm trying to decide between the other three for my upcoming trip. I'm leaning towards the Plaza, though I could be easily swayed towards Tony's.
It's so tough as you get such a mixture of reviews for all of them. Personally the menu at LTT doesn't appeal much, I think you would need to be going for the characters in that instance (my opinion obviously, as I'm sure plenty will disagree!!)
If you don't mind going to one of the resort hotels, that isn't a bad idea. Kona's is very good, and I like Citrico's too. In my case though, it wouldn't work to go outside of the MK for the meal.