Saying their 3rd overall priority for the entire series is a tie between Rogen and "shitty promos of Obama" based on the fact that they had *one* segment of *one* episode about Obama pretty much proves that you're irrationally attacking them because you, personally, for whatever reason, hate them.
As for them testing myths that are clearly true or false to anyone who understands Newton's laws. . What's your point? The show puts myths to the test. It wouldn't last very long if every segment was Jamie saying "Well this would be fucking obvious to you viewers if you weren't science retards."
A lot of myths are obviously bullshit to people who are well-versed in whatever subject the myth is about. The show is aiming at people who are not well-versed in those subjects, but who are interested in learning something about them (and who like something to blow up from time to time, which really is most of us ;) ). It's pretty obvious to me that if the powerful radar in the nose of an airplane, not to mention the air-to-ground phones installed in the plane, and the radios, and all the other emitting electronic devices don't screw up the instruments in the cockpit, then my cell phone certainly won't. But to people who don't have experience with radio communications, or who don't even know that airplanes have all those things installed in them, it might not be quite so clear. Doing an episode about that myth, therefore, makes sense - a lot more sense than opening and closing the segment with "Do cell phones interfere with airplanes? No. Duh."
Rather than insulting viewers by telling them that if they actually knew something they'd know the myth is BS, this show presents the information in a more entertaining and accessible way. I feel fairly safe in guessing that you'd agree with me that science education in the US is largely crap, which is why so many people fall for bullshit like life force bracelets and other stupid products. As we therefore have a large population of people who might be perfectly fine in the intelligence department, but nonetheless ignorant about aspects of science, a show that gets people interested even in a peripheral way about science or, at the very least, the scientific principle that you don't just randomly believe any crap you hear about, but test it out to see if it's plausible, is in my book a pretty good idea.
Plus, being pissed off at the 2 cohosts for not being physicists when they never claimed to be physicists, and specifically state in the intro to the show that they're movie prop makers, is kind of silly. They're two reasonably intelligent people who are very good at making custom devices and are therefore ideally suited for an "average joe wants to know about this myth" show.
I certainly don't make the claim that the Mythbuster crew is composed of scientists or that the show is about rehashing science that everyone should, according to you, already know. But Mythbusters doesn't make that claim either.
I suspect your version of the show would be very much more scientifically rigorous and educational, and thoroughly grounded in whatever discipline the myth-of-the-day required.
I also suspect that no one would watch it.