Top of the MK list, we like CRT (food & dining in the castle are good...but it is expensive $$ or 2 TS if you're on the dining plan, so that's a big consideration.)
Next choice would probably be The Plaza, followed by Tony's, then Crystal Palace. Liberty Tree would be bottom of the heap for dinner, for sure...agree with PP that LTT dinner is too much like regular dinner food you'd find in your own kitchen...nothing special there. Not actually bad food, just nothing to pay those prices for, lol.
If you can leave for awhile, I'd hop the monorail and go to Kona Cafe, or The Wave, or the Grand Floridian Cafe. We've had great meals at all 3 places...each are one TS credit if you're on the dining plan, too.