It was my first mudfest, and overall, I enjoyed it. I don't know if we'll go back in August because I think it will be too hot. I'm a wuss!
As for the potty situation, just be more prepared, bring a pop up potty, they are like $30 and use regular trash bags. Although, if you're not camping, I don't know what to tell you - hold your poop?
My biggest complaint was the kidlets running around. I saw more drunk teenagers being stupid crazy on 4 wheelers than I cared for. And, I'm not a prude, I like to party, but I'm old enough
56,000 people? I find that real hard to believe... I go to a festival every summer that has 100,000 and it at least 10 times bigger than MudFest.