If you are looking for a character meal, we REALLY REALLY liked the Garden Grill in the Land when we were there last February. My mom, sister and I thought the food was really good--basically turkey, roast beef and catfish. There are really good mashed potatoes and bread too. The characters are Pluto, Mickey, Chip and Dale. They are dressed in farmer clothes. The restaurant wasn't crowded, so all the characters came by our table at least three times each. It was so much fun! Plus the restaurant is rotating, your kids might like that.
For TS in the World Showcase, we like Chefs de France, Le Cellier, and San Angel Inn. No kids travel with us, but my sister is super picky and always finds something to eat.
For CS, we always hit the San Angel Cantina or The Lotus Blossom Cafe--they have good ice cream.