Oh fun! Love to see what everyone likes and dislikes about different restaurants. So last year here was my best and worst. I have food allergies (dairy, gluten and food dye) so my responses are of course based only on the things I was able to eat.
Best - Trail Ends, the chef here was amazing at making me dishes from the back even though this is a buffet. There were only a couple of things on the buffet that were safe, but the chef checked back with me several times, brought safe dishes from the back for me, made a really pretty dessert that I could have, etc. I didn't catch the chefs name but this was in September of 2015, whomever was the chef during that time, he was the best on property for food allergies that I've ever experienced at Disney World. So that was my best meal of the trip.
Also I have to mention Chef Mickeys too, because the chef there was great and did bring a lot of dishes from the back to make sure I had plenty of options! Also Raglan Road was great with my allergies, lots of options there so I have to mention them!
Worst - Biergarten by a far. Allergies or not, the food was awful, no one in my party enjoyed it and it's not somewhere we will try again. The consistency and texture of the food was just off to me, everything was mushy and bland, I thought maybe it was because of my choices compared to everyone else's but since no one in our party of 6 enjoyed it I know it's one we can mark as tried it and didn't care for it. Also here, the chef wasn't interested in helping for my allergy I was merely showed what I could eat on the buffet and not offered anything else.