Yes, I watched it last week and despite being quite open minded I found the whole concept completely laughable.
As soon as Mark Sargent tried to demonstrate the lack of curvature of the earth by pointing out the Seattle skyline on the horizon and saying words to the effect of "if the earth was round you wouldn't be able to see that", the only thing there was a lack of was an understanding of the rules of geometry. The series of bungled experiments that then followed throughout only served to solidify my contempt.
They can't even claim that the filmmaker made them look like a bunch of idiots, they did an absolutely tremendous job of that themselves!