One circumstance I can comment on is the transportation situation to and from Hockenheim. It's a bit remote - but no more so than, say, Silverstone. (And not so much as Watkins Glen :-). Hockenheim's a small town with a very small train station so the public transportation aspect was a bit of a negative. The trains were inconsistent and thus sardine-packed when one finally came. The last day, there was a problem on the tracks (accident) and the trains were all delayed so we grabbed a bus at the Heidelberg bahnhof (same starting point as the trains) and it took us directly to the Hockenheim bahnhof (same dropping off point as the train). The bus was half full and comfortable and the ride was nice and took no longer than the train. If there were a next time, we'd absolutely take the bus. Made me think maybe the race organizers could take some lessons from the folks in Austin.