Duane, Carnivale is probably the most underrated show on TV. It is the X-Files, but in a good vs. evil motif, with tons of religious overtones, and with a better overall arc.
IMO, though, it would be very difficult to jump into the show now. They spent the entire first season (which is now available on DVD) setting up the characters, and just now the plot has taken shape. With only 3 episodes left this season, it may be a little hard to absorb.
It is a very strange show, though. Strangely addictive. It's strange on the same plane as the movie Blue Velvet.
The acting is excellent, as is the screenplay and the writing.