After reading the posts, I'm tempted to add the other places we think are overrated, but I'll play by the rules & stick to my most disappointing meal.

Besides, my list may get long.
No offense, but I just don't get this "theme park food" excuse some people love to use. WDW isn't serving nothing but hamburgers & hotdogs. If you aspire to do better, you should. They once did. Are we also willing to say, the attractions are just "theme park rides?" I see no difference.
Universal has a Palm Restaurant, which compares favorably with Ruth Chris. They also have an Emeril's that's as good as any other Emeril's we've eaten at. The other Emeril's hasn't thrilled us, but many people love it. On a whole, we find the food at most UO restaurants worth the price. (The many Cafe's are the exception.) Swan & Dolphin also have some excellent restaurants that we feel are worth the money. These are all "theme park restaurants". The food at most WDW restaurants should be more in line with the price. We don't expect to pay the same we would in a small town or even most big cities, but the signature restaurant prices should buy a consistently excellent meal. I don't think we should excuse away the food decline in recent years. If anything, they should be striving to produce better quality food. Most of us are a captive audience at WDW. This is not true for Busch Gardens or Six Flags.