Indeed the Kelsey Grammar label was enough to make anyone sceptical, but what a relief and what a thoroughly entertaining performance and set of characters he puppeteers.
As mentioned in other reviews this is an epic tale, much like The Wire, but Boss is much more sinister and the moral degradation is not a slow burn, but a rapid haze.
Part of the genius is casting the iconic and likeable Frasier as the veteran mayor, who has forfeited all moral convictions to further his own gain. As he twists and turns in and out of political and personal hazards you are compelled to believe that he will eventually reach some sort cathartic pivot point - but he will keep you wanting.
This is terrific stuff and should not be missed.