Well, Id prolly rate it that high too. Im not sure Id rest it all on him but more so that he takes the people there to ride it.
BTW Canadmos...just because it was engineered wrong doesnt mean it cant be altered or fixed by maintenance. Ive seen this done quite often. They just need to get in there, figure out a fix and get to gettin. Not everything comes spec perfect from the factory. TTD trains had to be sent back for some issues that were outside the reach of maintenance but they were the ones that noticed the issue.