"Battlestar Galactica" ended it's season last week. Cable runs on a different schedule than network shows.
As it is, I've never been able to get into "The Shield". The characters are all hard-edged without any sympathy that would make one "root" for them.
BSG and "24" have people that you like(who can't help but adore Chloe?), and want to succeed. That's why they do well and "The Shield" sort of rots in obscurity. The morning DJ's I listen to love the show, but I can't make the connection. "Rescue Me", if it ever comes back, is a much better, and a lot funnier, show.