Obviously, this is very personal and YMMV, but: They're some of the most engrossing games I've ever played. Factorio is the only game I ever started a session

Obviously, this is very personal and YMMV, but: They're some of the most engrossing games I've ever played. Factorio is the only game I ever started a session with a friend at 9pm on a work night saying "just a couple of hours" and ended up playing until 5am. They have this kind of bad side that they almost feel productive, too, where you redesign/rebuild something and fix a problem you had and suddenly the hours spent feel like you did something worthwhile. I find them very fun and not at all boring. I almost entire solo them but playing multiplayer with good friends who want to play productively, they're even better.