According to PEW:
When it comes to mixing news and point of view, at least seven-in-ten NPR listeners, "Colbert Report" and "Daily Show" watchers and USA Today readers say they want news without a point of view.
As a regular viewer of these programs, I tend to agree, but I recognize the irony. Stewart and Colbert unquestionably present a point of view, and typically a politically liberal one. What makes these programs unique is that these viewpoints are disguised by satire, which has some interesting implications for what results when comedy and information mix.
Personally, I find their views to be logical and well informed and their humor to be...well, humorous. Still, maybe that's a rationalization for my own biases. Something worth thinking about...