But if they are not doing science, why would you evaluate them on the basis of science? The MDC and the mythbusters show are not scientific experiments. They draw on scientific principles in coming up with their tests/demonstrations, but they should not be confused with science.
The critique that some JREFrs make of pseudoscience should be evaluated on the basis of those critiques, not on what happens during the MDC or a taping of Mythbusters.