For those who find the Mythbusters as presented difficult, there's always the "watch the DVD and FastForward through the recaps" approach.
I think the degree of scientific rigor varies from topic to topic, but they are demonstrating the scientific approach--including the "whoops, we didn't consider that" and "what would disprove this" aspects--quite well. I think a number of kids who would not otherwise consider questioning internet videos, let alone testing them, are acquiring an important bent towards skepticism from the show.
And, while I have no personal stake in the matter, I thought Kari was still smokin' hot while very pregnant. But then, a woman wielding a welding torch or firing high-caliber weapons is always a good rolemodel, IMHO...