It really depends on the children.
My kids love rice (DH is Korean, I'm Caucasian), so they absolutely love the CS in Japan. I mean it is a must do every trip! Now, we went with our friends in 2006, and her kids ate almost nothing. She's Italian, and they aren't so much into the chicken and rice kids' meals (we ended up helping them eat it).
There is a lot of great CS in Epcot. I think it really depends on the kids' likes. I agree - Electric Umbrella is fine for burgers and fries. And Sunshine Seasons my kids like for the Chinese style noodles, and breakfast is good there. I know there is Mexico as well (never done that) and others.