His show is a news show, and its a commentary show, and its comedy show. It is all of those things, the comedy aspect does not give him free reign to to disregard all of his advice to the MSM. Making jokes at certain things is expressing a view on them. He pleads with the MSM they have so much power to do good, but he also has power to do good. Sometimes they use it, like the daily show's coverage of the Iraq war, but a lot of the times they don't. Okay maybe I don't expect him to grill his guests, but he could ask better and tougher questions while still being funny. Is there no bias in the daily show as a whole, can't it improve a lot as well? Easily, if TDS staff take up more of Stewart's advice.
People don't look to his show for a bias free experience, but they don't w/ the MSM either. People don't have that high of expectations for cable news, because they have come to expect it, that does not mean they can't live up to a greater standard. I don't see why his show is just in some completely different dimension in his opinion.