I would have to say Tony's in the MK. We had ADRs and waited and waited and waited while other parties with ADRs after us were seated. My granddaughter who was a mere toddler at the time was really getting antsy. After we finally got seated the meal was just mediocre at best. The manager comped us our dessert.

A close second would be O'hana. We had dinner there 2 times with the same results. Meal was rushed and the meat was tough and the service was really lacking (we did like the dessert). We found the breakfast was much better.