honestly, great
have you ever wanted to roleplay 40k imperium, star trek klingon, earth aliance from babylon 5 or just about any sci fy empire you can imagine, or your own? this is the game, no way around it
it is, unfortunately, a paradox game, and that means DLC out the backside, HOWEVER this one is more "modular" than Crusader kings of hearts of iron, all dlc are themed on one thing so, if you, for example, dont feel like undead empires, megacorps or what have ya, you can not get that DLC and dont lose part of the experience
that said, while it IS great fun in singleplayer, you can get many, many hours of fun with it, with friends, be it in a "who beats the snot out the other first" or actual roleplay, is a grand time
honest recomendation