Series 1 - couldn't look away, binge watched in two sittings. Gripping, Trilling and thoroughly engrossing.
Series 2 - canned it after struggling through two episodes. E1 is pretty poor, seems like trying a range of plots to see which one sticks. Barely made it through E2 (it was a quiet night) and not bothering with the rest of this season. The funeral plot/scene is one of the worst scenes I've ever seen on TV - what exactly was the point. Catherine seems to have become her own Dirty Harry, except she's not Clint Eastwood, just an angry and miserable bugger who spreads misery to anyone unlucky to stand close enough to her.
Watch S1, skip S2, will check back for S3 when I've hopefully got over the regret of wasting two hours on S2.