I'm a fan, not of his comedy (although that segment in post #41 is ****ing gold), but of discussions he frequently has on his show.
His show is one of the very, very few on television where you get unscripted, genuine arguments between leading lights of their respective movements.
Take this argument he had recently between Glenn Greenwald (really the brightest light for today's civil libertarianism) and Andrew Sullivan (a conservative Obama-apologist) over the killing of Anwar Al-Awlaki:
Now, again, you can say whatever you want about Maher personally, say whatever you want about how much you disagree with Sullivan or Greenwald.
But this is a high quality argument that is not partisan or scripted. And it's relatively frequent on Maher's show. He deserves applause for making this possible.
His humor, meh. It's a bit lazy, not my style (I prefer the Daily Show/Colbert's efforts, which are much more in-depth and less reliant on obvious poop humor). I saw Maher live about two years ago when he visited Springfield, and his act was about two years out of date -- he had taken literally no efforts to update it. I know he's got a busy schedule, but that's lazy as shit.
And unlike Stewart/Colbert, it's pretty obvious he's a huge dick. Which he happily admits.
I'm not a fan of Maher the person, or the comedian, but as a layman moderator of usually high caliber political discussion, he's a rare breed on today's television.