We don't really have a "bottom 3" because we have liked all of our dining experiences thus far. The only one that was really underwhelming was the luau at the Polynesian. DH and I both thought that the food should have been better--it was just so so--and it lasted too long. But we still had a good time. DH was also thoroughly unimpressed by all of the character breakfast buffets. Nothing was *bad*, it just wasn't as good as what he was expecting for the prices.
Top four in order (I can't pick just 3!):
1. Artist Point (so underrated, so delicious, would live there if I could)
2. Narcoossee's (love the romantic ambiance, view of MK, and the food)
3. Ohana (meat, meat, meat, and fun for the kids)
4. Akershus (family style is tasty, DH and I like the Scandinavian food options on the buffet, and the princesses are so much fun)