We have been to DW twice now. The first time was with Deluxe Dining. While we haven't had any "worst dining experiences", we've had some less than enchanting experiences for various reasons.
Tony's Town Square (dinner) - We will probably not visit again anytime soon. The waiter was very scarce and we never got refills on our drinks. The restaurant was dirty feeling. The bathrooms are not adequate for the amount of customers they have.. seriously, 2 stalls in the women's restroom? The restroom, that you have to go to the lobby to get to, was disgusting. I was thoroughly impressed with the cleanliness of restrooms at the parks until then.. Food was just EH. Had much better at Mama Melrose.
Sci fi (dinner) - Service was fine and we were lucky enough to get a car table, but food was flavorless. I had a burger and I swear it tasted like nothing. Waitress pushed desserts on us after we told her we were full, thank you. She boxed up fruit and flourless brownies for us "to go". We really didn't need or want these, but took them anyway.
Ohana - We love Ohana, but the wait is dreadful. Do not expect to get in before at least 30 minutes after your ADR time. Food is good, but we prefer the salad over the lettuce wraps and I personally think the noodles are too gummy. The first time we went one of my sons asked for a hot dog kids meal, at the waitresses suggestion, and she never brought it. We didn't think much of it, though.
Landscape of Flavors - I seriously hope it's gotten better in there because we are going to AoA again this December. I'm not a fan of the different stations and utter chaos of the whole place. It's particularly taxing on a family with multiple kids. Having to go to one stations for kid A, then B, then C, then D and finally it's time for the parents.. by then you've zig zagged all over the place. A nice touch screen order area similar to Sheetz would be FANTASTIC in there!
Coral Reef (dinner) - Didn't care for it, but nothing stood out as too bad. Disappointed to be seated as far as possible from the tanks and we were coming off a really crappy rainy day so we were irritable to begin with.
Akershus (breakfast) - Felt more rushed here than at CRT. Buffet wasn't impressive to me, but I enjoyed everything else brought to the table.
BOG (lunch) - This is easily our most favorite restaurant for dinner so we were very excited to try lunch here and choose our own seats etc.. This was while they were still testing FP's and I got up to the podium and of course the gentleman said our reservation wasn't in the system, please move along and let the next person up. He was rude and unsympathetic, offering no advice just dismissed me and went to the next person. Now, I have some sympathy for them having to deal with everyone in the park coming up there and wanting to get in and having to turn them away, but dang it I KNOW I had a reservation and you know the system is glitchy. Do NOT treat me like someone who is trying to scam my way in. It's hotter than the surface of the sun and we were turned away with no suggestions. Finally, I got the bright idea to pull it up on my phone and sure enough it showed up so I marched back up there to show the gentleman and of course he was gone. The new person at the kiosk let us in, we ordered and were led to a seat. We didn't get to pick at all which was disappointing since it was part of the appeal of lunch. Food was nothing to write home about and certainly not worth the hassle.
Trails End Buffet (dinner) - I have seen no bad reviews on this, but I have to say I will not be returning to this buffet. It was seriously lacking, just felt like a half empty buffet. Waitress was pretty awesome, though.
Crystal Palace (breakfast) - First time we ate here I swore I wouldn't do it again. They pack too many people in and I feel like I was going to elbow people around me. Waitress was forgettable. Second time, however, we had the BEST server named Kip and he just blew us all away. We still talk about him.
Mama Melrose (fantasmic dinner package) - We love it. Food was delicious to us and our waiter, Brahim, was fantastic - even giving DH and I champagne for our anniversary. We'll be repeating this year.
Hollywood and Vine (breakfast) - a MUST for us. It's loud and playful and great to wake those sleepy kids up. Never experienced cold food or filth like being reported in this thread. Maybe because of the time of day we eat?
Tokyo Dining (dinner) - UGH. Won't do this one again. Seated well past an hour after our ADR and took just as long for our food once we ordered. They overbook worse than any restaurant we've experience. Food was ok, though.