I'm sure I'll get flamed for my comments, but here goes.
I've stayed at every WDW resort at least once, but most I have multiple stays. My choice for worst resort ever goes to Coronado Springs. I've given them three chances and I won't go back.
My first stay, we were in the worst room I've ever seen at WDW. The resort was barely a year old at the time. The wall paper/border was falling off the walls. The carpet had waves in it from the moisture. The bedspread was threadbare. Requested a different room and they said there were none available.
My next stay, the room looked better upon first entering. However, after we used the bathroom the toilet began leaking. We called maintenance and they said they would send someone within 15 minutes. One hour and 15 minutes later, someone from maintenance showed up and said he couldn't do anything about it until the next day (this was at 5 pm). DH said that wasn't good enough as the water was starting to leak onto the carpet in the room. Two hours later, DH was finally able to get us moved to another room.
For my third stay, I was at Coronado only because it was the host resort of the 999 Happy Haunts Ball. Since I was traveling alone, I specifically requested a ground floor room close to the convention center. This was due to the fact that it was a merchandise event and I would be carrying large bags and boxes back and forth to my room. Well, I was given a room on the top floor, away from the elevators in the farthest Casitas building. When I requested a different room - you guessed it - I was told there were none available.
I also do not like the fact that there is a 15% charge on the food in the Pepper Market. I am perfectly capable of refilling my own drinks (which I generally have to do there anyway) and don't care if I use flatware when I eat. Their preparation times are also longer than most other food courts and I don't think there is any difference in the food quality.
I have heard similar complaints from other people. My favorite, though, was from the person who was charged for a Water View room and they had a view of a water fountain!
I never recommend CS to anyone for these reasons and others.