Oh, I know the CAUSE of the stench. The foam rubber absorbs the sweat from the riders, which then festers all day in the heat... That's not actually totally the PARKS' fault, but they should at least CLEAN them.
They were actually very INCONSISTENT with the dispatches on Superman. I think part of the problem is the seatbelts on the Intamin megacoaster cars -- some people just can't seem to figure out how to OPEN them (I observed the same problem on Millennium Force).
I once saw a train leave the station as the other one was hitting the break run, but more often than not they were taking well over 4 minutes (the worst I timed was 5:12), hence my "5 minutes" comment in the original report :)
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--Greg
http://www.pobox.com/~gregleg/