There is nothing wrong with SFA; it's the people who live around there. Both the employees and the clintele leave a lot to be dessired.
I can think of sevaral rides that I would consider mistakes:
X- It could've used more time for devolment. It's unreliable and does not have good capacity. Because is not like anything else out there, everybody still rushs out to ride it. That and the capacity makes makes for four hour lines.
Deja Vu- Same
Winnie The Pooh (Disneyland)- It replaced a classic and was done on the cheap.