Whispering Canyon
We went there for lunch, so they have a slightly different menu than dinner. But, I had the nachos for an appetizer. It was huge and very good. Then, the stackhouse sandwich - excellent. And the chocolate cake was great. DH had the chili - great choice. I don't think you can go wrong with this one. Kid's meals were great.
Coral Reef-
Unfortunately, I'd have to agree with most of the poster about not being the best food. I have the cream of crab soup. It was a little tasty, but very lumpy and not much crab. I heard better reviews about the crab salad and the shrimp. I had the steak. It was fine, but not one of the best - the potatoes were very good. My neighbor had a miserable steak - she is more of a steak person than I am. My husband had the Mahi Mahi and said it was awful. The chocolate wave was great. The kid's meals were awful - my kids didn't touch a thing and they are picky, but not that picky. That said, we will be going to eat there again in October. We will have 5 children and I thought the place was very much an experience - beside the food. I would say try to change this one, unless you want to go for the experience of eating with a fantastic view of the aquarium.
Sci Fi-
Get a milkshake or smoothie - it is part of the dining plan! I had the chili - excellent, but the onion rings (I always try to spy other people's food as it goes by) looked great. I had the Rueben sandwich - very good. I'm sorry I don't remember what DH had. I think the ribs, but whatever it was, he enjoyed it. For dessert, hot fudge sundaes - great. I think this is another one that you can't go wrong in.
Le Cellier - I haven't eaten there, but I hear the best steak in WDW.
Enjoy!