There are lots of things to do in this game, but none of them matter. The journey is the destination and you make your own fun. Some find it boring, some find it deep, but I found it entertaining...for a time. Then I found it boring. Also their UI is looks and feels like it was desinged for a mobile app. Yuck.
Having played the game for awhile I started to notice aspects of it that seemed severely under baked like for example, diplomacy and espionage. Reading up on the topics in the official wiki, I come to find out that the features that I thought were missing do infect exist. For a price. It looks like Paradox carved out a number of key aspects of the game, only to turn around and sell them as DLC. Not cool. Also the UI is a mess, with key information buried in weird, unintuitive places and information that is largely useless, misleading, or just plain wrong, displayed front and center. It’s a good thing I bought it when it was heavily discounted, because the base game is more like a bare bones addition then a full game. I would have been very angry if I had spent $40 on this. Stellaris is not a bad game but one that, in my opinion, fails to live up to its potential.