When I was last in the US my partner had only one day left before returing home so I (being the coastery one) had to make the decision between Knotts and SFMM. Having heard so much about the wonderful X and other rides, we hired a car and made our way from Disney to MM.
Yeesh. Of COURSE X was broken down, as was Revolution (which, while mild, is a coaster I had wanted to ride since I was young - bit of an icon really), plus several other rides. The rider ops were uniformly surly, the food attendants the same, and the whole place had a skeezy, ghetto, blah feel about it. As I had overhyped the park we ended up having a fight about my terrible choice of parks, wasting his last day, etc etc - then we got lost coming back to the hotel.
It was the lowest point of a wonderful (Disneyland, Knotts, BG Tampa, and others) trip!