San Angel Inn...beautiful atmosphere, but the food is horrible. But I am spoiled by living in an area where I have access to really good different types of authentic Mexican food...which I eat at least once a week, if not more...Mexican food is my favorite food in the world!
The second worst meal I've had at WDW would be Tony's. The food was so so...not bad, but not really good either. The thing that that totally ruined the meal for us were the bugs....I understand that this is not a problem all year (and I know other places have had this problem at times, including Ohanas), but it was AWFUL...some sort of knats or something everywhere...floating in our drinks, stuck to our butter, buzzing around our heads....come to think of it, I can't believe we did not just walk out, and that we actually paid for a meal we could not even eat. But is was our last night and we were tired and did not want any drama. But it left a bad enough impression on us that we will never have a desire to eat there again...it makes me sick to my stomach to even think about it.