I can think of only two places that we're not in any hurry to return to:
1. Jiko. We wanted to love this place...we REALLY did! But, the filet I was served was nothing but fat - it was awful. I asked to send it back, only because it was completely inedible. When it came back to the table, it was practically raw!

At that point, though, I was afraid to send it back again, so I just ate the edges of it! LOL The service we had was WONDERFUL, though - the best we had that entire 2-week trip! And, I should also point out that our appetizers and desserts were phenomenal! I think I was just expecting more from the filet. We'll give it another chance at some point...just not in the next couple of years!
2. Rose & Crown. By FAR, the absolute WORST dining experience we've ever had in Disney!! We waited over an hour past our ADR time, which has happened before and doesn't bother us - we know restaurants get backed up from time to time. But, when they started to seat parties without ADR's in front of us, that was a little bothersome! The waiter there was VERY friendly, but I think he was a little overwhelmed. He brought us beer that another table had ordered; My wine glass had some sort of white, crusty stuff on it, and when he brought me a 'new' one, it still had the white, crusty stuff on the bottom!!

Again, he was very, very nice - I actually felt a little bad for him, because he was obviously a little stressed! But, it wasn't a good experience overall, and the food was just mediocre at best. Again, I wouldn't completely rule it out in the future, but it will be some time before braving it again...