Just finished watching 'The Leftovers'. I thought it excellent. OK, it kinda changed tack from Season 1 and it did all get wrapped up all a little too quickly and conveniently (Season 3 could almost be considered as padding out) but it was a wonderful series none-the-less. Excellent acting (Chris Ecclestone was superb I thought), intriguing plot lines and some wonderful, but light, comedy moments. Yep, gets a 'recommended' from me.
Edit: from reading earlier posts, I agree with comments made. It's a series that takes a 'what if' scenario and looks at the reactions of individuals, how faith and belief are challenged, how people seek answers to the 'what if'. There are some truly excellent and emotional scenes that explore belief. Fear not, it's not about religion per se, though obviously that's a part, but about what people believe. I'd actually rate it amongst the best TV I've ever watched.