oh it is!
buggy a bit. But what Total War game isn't. lol
It also has a thing called Realm Divide once you get close enough to Kyoto. Which, without mods, kind of screws you over immensely on higher difficulties. And even on easy sometimes. It's hard to describe really...but the most important thing is...diplomacy no longer works. Ever.
But aside from that, it is so damn fun. Especially for someone like me who is a huge Japanese history/lore/mythos fan. The sengoku period is just fascinating to read about and it's so fun to play a Total War game set in the period.