We never considered leaving, though if the weather report I got online when I first arrived didn't say 'light showers tonight and sunny for the next three days', lol, then we would have looked for higher ground. That soil was awful, and had already been churned up by either horses or cattle and liberally dotted with manure. We were in a ground tent, so it was a bit tricky to get the cots leveled - I do feel sorry for anyone who was trying to sleep directly on the ground. Our tent stayed warm and dry though and felt all the more cozy in contrast to what was outside.
After the rain, I had a little difficulty getting the car in and out of our actual campsite - nothing a bit of back and forth couldn't cure, but once I was out in the slop and got some momentum going in my favor, the only tricky part was keeping everything going the right direction. That was with AWD - not sure I'd have had the same luck with 2WD or a trailer. I have some decent AT tires, but I think the mud turned most tires into slicks within seconds anyway. A good 4WD shouldn't have had any problems. I had one tricky moment when a jeep that I was behind pulled to the side and I thought he was stopping, but when I went past saw that he'd pulled over for some oncoming traffic. By the time I realized what was going on, though, I was in the middle of the intersection and thought if I stopped there I might get stuck, so I just went to the side the best I could. Fortunately it was only one car headed up the road so I was able to just keep going. Anyway, sorry for that to the guys directing traffic - I'm sure I looked like a jerk just barging through.
My only actual gripe is that we were told by one of the volunteers that all of the driving classes had been canceled, and it looks like that wasn't the case. That's an understandable mixup, though we both skipped what would have been some good classes as a result. As for other regrets, I think the biggest was that the mud prevented us from exploring the campsite, meeting people, getting a good look at other setups, etc.
I'd say that all things considered, we enjoyed ourselves but didn't get enough out of the overland experience package to consider it money well spent. At the end of the day, though, we accomplished our only real objective, which was to decide on what kind of trailer setup we wanted to go with. So with that in mind I suppose I can't really complain.