I watched the first season and the first episode of this one. I enjoy it a lot, but it is so dark that it depresses me. It isn't just the story, either. The camera work, lens filters, set decorations... they all just keep suggesting a hopeless spiral into depression. I'm going to have to finish this season.
I just started watching this show a few weeks back and I just got caught up last night. This is a very interesting show, one of my favorite shows that I've watched recently. If you haven't seen this show yet do yourself a favor and check it out, the new season starts tomorrow night at 10 on AMC.