Let me start off by saying, this series does take some getting use to. The initial few episodes are not very interesting, but they are worth watching. If anything the amazing chemistry and acting of Richard Madden and Annabel Scholey makes the slow pace of the first few episodes a lot more entertaining and definitely worth watching. And the final few episodes turned a decent series into a great one. The main characters are very well cast, maybe with the exception of Dustin Hoffman. And as the season progressed, I find myself connecting and caring with many of the characters, and their interesting backstories. Whether it's Cosimo's love story, or the long family feud, I genuinely do care about what happens to some of the characters. I have to say Annabel Scholey probably gave the best performance out of the whole cast and really made the show great.
Its not perfect and at times does seem a bit slow. But overall the series was great.
PS: It's very historically inaccurate, more of a drama then anything. So if that bothers you don't watch it.