I think the worst meal ever at disney was at sci-fi earlier this month.
I don't eat meat, though I eat seafood, and there were 2 entrees to pick from. I asked the waitress which one and she gushed over the pasta with shrimp. Well, awful doesn't begin to describe it - the cold flavorless pasta with congealed cheese on top, a sauce that seemed to be just grease with no flavor, and the kicker was when I said to dh "this shrimp doesn't taste right, I can't tell if it just because they did not use any seasonings or if it is really bad" I only ate the one and then pushed the plate away. Well good thing I only ate the one, I was in the bathroom at the hotel until 4 AM puking my guts out. If I ate more I probably would have been in the hospital.
Others fall into the "not as good as I hoped but not horrific"
Hollywood & Vine - loud, messy, and generally not that great of food
California Grill - 1 1/2 hour wait with ADR. Overpriced.
Liberty Tavern - Boy was I disappointed. The food was bizzare, meat heaped on a plate?? If you like meat and potatoes, this will be up your alley, otherwise don't bother.