Like a lot of British procedurals seen in the States, Broadchurch was originally shown on ITV, like Downton Abbey and other shows shown on PBS on this side of the pond. So many people think these are all BBC productions — and I suppose the name of the network over here doesn’t help — but this is an ITV production.
Broadchurch became a national event in the U.K. earlier this year and it really keeps you thinking. As Tennant points out in the NPR interview, the format — one murder over eight episodes — allows for more plot and character development than you find in the traditional one-hour stories told on U.S. procedurals.
I won’t give away anything — I’ve already seen it!! — but I certainly would urge you to watch! (And not even because I’ve been mad for David Tennant since he was “the Doctor!”)