Loved it! Liked it even more than I was expecting to, and I had been keeping an eye on this show ever since it was first announced. I lived in Japan for a while and have long been a fan of Japanese classic samurai/ninja cinema. It is so awesome to see this show bring back some of the great shinobi tropes, themes, lore, etc. From the great classic shinobi films of the 1960s (which are largely little unknown outside Japan). I particularly REALLY liked the depth of character/family development here, the emphasis on the human element of being a shinobi/ninja, and to see excellent martial art action that is done in a very grounded, realistic manner. The action was fast, visceral and not over the top, which made it all the more impactful.
The show is not perfect of course, but on the whole very entertaining and well done... The acting, production quality and action are all top notch and this is the exact kind of high quality drama series that I've been waiting to come out of Japan for a while now. There are so many original, interesting things Japan could be doing with TV/streaming series incorporating unique, rich cultural elements and the unmatched cool factor of samurai/ninja history, lore, etc. We will hopefully see even more productions in the future along these lines!
I really hope House of Ninjas gets a season 2! The first season has wonderfully established a world, a unique style/aesthetic, characters we care about, interesting themes and realistic badass action which could really be expanded upon in future seasons. More please!