Very good first season.
It didn't grab straight from the start, although having an early tremendously good episode (ep 3, focused on Matt, one of my favorites characters).
Not rating this one higher because not all the characters and their stories pleased me, in fact some of them were a bit annoying to me and I found their part in this to be almost irrelevant.
Overall very well written and acted, with a perfect use of music to add an even more depth and emotion to the scenes.