Everything you could hope for and more in a sequel to Crusader Kings 2.
You would be doing yourself a real disservice if you don't try Crusader Kings 3.

2018 Update: Still my undisputed favourite game of all time, you are doing yourself a major disservice if you don't give it a shot.

One of the best strategy-role playing games I've ever played, select literally anyone anywhere in Europe during the middle ages and watch as your family rises in power, falls, and rises again over the 400 years of conquest, intrigue, backstabbing, incest, and family conflict.

Be prepared to sink many an hour into this, especially if you can drag a friend or two along with you into the multiplayer, where the backstabbing gets personal.

DLC is not required as all it does is unlock the ability to play as different groups of people, though the "Legacy of Rome" DLC is recommended as it unlocks the ability for everyone to utilise standing armies (retinues).