This is a complete thread derail, but...
I feel it's unfair to compare steam usage of a game after one week to a titan like CIV 6.... Time will tell... Also, as said in previous comment, this is a real multi platform offering, so we'd have to see console sales also to correctly judge.
I have Midnight Suns... It's a lot of fun... Is it perfect ? most assuredly not... has a lot of performance issues on PC... I'm confident THAT will get better in time...
It's quite a fun game for Super Heroes fans that like RPG elements, character enhancing, some lore and an X-Com like combat grid with 100% card based combat and limited use of environment....
there's also an important amount of map exploring and RPGesque grinding to get elements for 4-5 different types of ... let's call it 'professions' to help RPG players understanding... I like that, but I feel a lot of people will be turned off by it.
What it is NOT is a fast action, 6 button gnashing combo combat moves kind of game !
It's not the game of the year, but it's honestly the first super hero game that I fully enjoy !