Why Is It Fun?! XCOM Edition!

I have a new article format I want to insert forcefully yet pleasurably into you brain array! It's called "Why Is It Fun?!", and it's similar to my combat analysis articles, except it's not limited to beat 'em ups and it's not just about combat mechanics. It's about the spectrum of interactions and the response of enjoyment/addiction you feel when you experience it. It's going to be very interesting seeing what themes emerge! Let's start this party off with XCOM: Enemy Unknown.