We're generally easy to please, but there are a few foods/restaurants we steer clear of at Disney. Some because they were just bad, some because they just aren't what I like.
Turkey legs. My kids love them at the local Renaissance Festival, but at Disney they just aren't the same somehow. They don't have that cooked over an open fire smoked taste, more like a "smoke extract" and salt taste.
Boma - I don't care for cinnamon or vanilla, especially in savory dishes, so this place just wasn't to my taste at all. And the Zebra Domes were just okay at best, I don't get what the huge attraction is. It is, thus far, the only DIS board favorite that has disappointed.
Pizza Planet - I don't know how you mess up pizza but Disney's perfected the technique. We've never had good pizza on property, but PP was by far the worst.
Crab legs at Coral Reef (no longer on the menu anyway) - Just rubbery, overcooked, and not good. I'll stick to the fish next time.