If you watched and like the first season, then this is more of the same, only better. Kelsey Grammer has such a presence and absolutely dominates every facet of this show just as his character does in the series.
Great cast all around and the writing is sharp and smart. Breaking Bad and Dexter, to a lesser extent, are the only other shows that are as riveting as Boss is. You want to get a sense of what "Chicago Politics" is like, then buckle up and anjoy.