I'm seeing quite the polarization, here: Folks either think it's the bees' knees, or think it sucks. For one thing, I don't think there's any use comparing it against Mr. Show: The flavor is very updated/refined/lower-key. I like that; it's a different modality, and one I could plug in to.
The key, I think, is that Odenkirk is trying to become a better and better producer of media products that aspire to true art, and I for one see TBBs as a step in this direction.
So: What makes TBBs look, to me, like such a step? The writing and directing are very well-integrated. This integration means that they don't have to rely on an "obvious" sketch gimmick to clue in the acting talent as to their motivation. Bob has a subtler idea, and he ably directs very able actors to achieve these subtler comic effects. Good on 'im!
I was just thinking of watching them again. Yeah! I think I'll do that!
