None of it is spectacular, but I love Toy Story Pizza Planet...it is refreshing to me that you can get an individual pizza and salad together for one price. It's amazing how good salad tastes when you've been eating chicken fingers and fries for days on end!
Backlot Express is good too, but if you are looking for food that's a little less "traditional" for a CS, then ABC Commissary is the way to go.