The season 2 premiere is tonight and I highly recommend the show. However, you really, really should watch season 1 first so the entire murder mystery they unravel in that season isn't spoiled for you. Anyway, the show is every bit as good as AMC's other gems like Breaking Bad and Mad Men.
Holder is my favorite character. Rosie's mom is my least favorite and she continues a strong tradition of worthless women in AMC shows.