The only two problems I have with MS are the ever-present squeal it makes going around the circuit and out of the station and the shuffle/jar it makes going through turns.
The squeal worries me more than the jarring, because it seems to be a simple lubrication job. It indicates poor maintenance. The jarring, though, is noteworthy, too. If one looks closely, you can see the gouges on the steel from the wheels going through the turns. Really, for a ride its size, the lines are never long. That in itself isn't a good sign.