Kevin Costner saddles up for TV in plodding 'Yellowstone'

Kevin Costner in 'Yellowstone'

(CNN)Kevin Costner has done some of his best work in westerns, and even with the History miniseries "Hatfields & McCoys" on his resume, his first TV series is something of an occasion. But "Yellowstone," a modern-day western airing on Paramount Network, gets bogged down in minutia and politics, and gener