The show had some ups and downs, but Galifianakis is funny. There are some clips on youtube that I suggest you watch if you missed this. The monologue at the preschool is a particularly good one.
Galifianakis is even funnier (and beardier) in the Comedians of Comedy, both the film for Showtime and Comedy Central show. So seek those out and watch them.
I don't know how I'm going to make it to the 100 word minimum. It's unbelievable that Zach Galifiankis's show didn't make it, but Craig Ferguson, best known as the British guy from the Drew Carrey show, has a talk show on network TV.