Annettes or Café des Cascadeurs for me.
Never had a bad meal in either. Annettes is always our first night restaurant, it's excellent value if you get the fixed price meal (drink+burger+brownie).
Blue Lagoon is the nicest inside but I'm not a fan of the menu. If I could get an Annettes burger in there I'd be very happy!
Walts is nice but is a bit too formal a Disney holiday (IMO).
California Grill is also very good but I don't take smart clothes to Disney and I'd feel out of place in jeans and a t-shirt in there!