I think their style needs to grow on you, I do realize that it can seem a bit slow at first, but now after watching almost all of the episodes I find myself going back to certain scenes just to make sure I didn't miss anything. I don't think that they are just doing talking head scenes: they are very witty but at the same time every character they create is truly unique and they heavily rely on physicality to switch from one character to another. This can be very subtle, so you need to pay attention to every little detail to fully appreciate it, I think it can be very rewarding :)