There's a reason everyone loves HBO. The premium cable network creates really awesome television. No conversation about the past, present, or future state of televised entertainment could be complete without mentioning HBO a few dozen times.
Because of this reigning ability to keep people hooked on its shows, HBO has been able to fund projects that would likely only ever work on HBO (Game of Thrones, Westworld, Boardwalk Empire).
But there's a lot of unchartered territory on HBO. It's a little nerve-racking to start watching a series that has already ended, because that's one hell of a commitment, but with the holidays coming up and more downtime in the near future, now is the time.