Don't rush, this is just the first book this season. I would def say if you don't have HBO, you probably should think about ordering it for this series. I'm blown away.
Although I know next to nothing about the content I have to think fans of the books are worried they are going to seriously dumb down the content to snag True Blood fans. The two "supernatural" series HBO tried before True Blood (Carnivale and John from Cinci) really bombed. Tales from the Crypt might count but it's probably too old to consider.
Did you watch this online? I thought the premiere was in like 2 weeks?
Darker than I thought it would be.