I'm just watching the series now. Currently nearing the end of the first season. It's actually good. I didn't expect much from it when my brother recommended it to me, but I'm hooked now. It has a good mystery. Like every show of that type, it has to have some kind of a mystery to make you keep watching. I like this one, it made me kept watching. I also like that almost every episode so far has been in some way plot-related, unlike many shows in which main characters run around for 3/4 of a season and occasionally bump into a plot-related episode.
It's got a positive grade from me.