I'm not sure if you're aware, but they also added a central story line and some 'farming' elements & side quests in the Atlas Rises patch (which was when I pick

I'm not sure if you're aware, but they also added a central story line and some 'farming' elements & side quests in the Atlas Rises patch (which was when I picked the game up on sale), and I found it gave me plenty to look forward to, at least for a while. It still felt a tad bit unfinished in some respects (a flashier 'ending' with multiple possible outcomes would be ideal), but I was able to get a lot of great hours out of it-- enough so that I'm definitely planning to replay from the beginning after this Next patch.