My worst experience was in Detroit. Flight cancelled due to an ice storm. Checked into a hotel half starved and exhausted after hours in the airport. Went to my room to find NO WATER. None. At the front desk they told me that a pipe had burst - they knew it when I checked in. Best of all, no kitchen. They had had a fire the previous week. The only food available was in a vending machine in the lobby and it was empty.
It was a big chain hotel - can't remember if it was Holiday Inn or not.