Now, I fully expect people to complain about rides and advise others not to waste their time by going on it - but, I expect to encounter that by talking to people who have gone to Disney, here on the DIS, maybe even when striking up a conversation with another visitor while at WDW at your resort or maybe a CS restaurant.
The ONLY time I have ever witnessed a guest standing by the RIDE ITSELF and telling people NOT to go on was for Stitch!
Seriously, this woman was saying that the ride terrified her children (by the looks of them, about 5 to 8 year olds), and that for adults, it was just crappy.
It was bizarre - at first she looked like a frantic woman approaching everyone nearby - I thought she was one of those - "the world is coming to an end" loons. She was THAT determined to keep people from going on Stitch!