When I got this Game first I played for 26 hours straight, because who needs sleep when there are Xenos to purge!
Then Leviathans came out and it hooked me again even thou Civ VI came out as well, but the DLC adds so much exciting new stuff that I just had to purge Xenos again
Now Utopia is out and boy, not only can I purge those Xenos, I can eat them, and my pepole love to eat Xenos. It's awesome really.