I would say it's that kind of show. I loved the book, I've read it about 10 years ago, so I knew what to expect, and it's a good adaptation (which is not an easy feat!).
It's sort of slow, Anjin is trying to understand the Japanese culture, while Toranaga tries to stay alive and win against his enemies without too much bloodshed. The story is based on irl English pilot getting into Japan, just as Tokugawa was rising to power to rule over Japan for over 250 years.
I loved it, my friends like it, my bf liked it, but I understand it's not for everyone.