And I'm not trying to say the games are bad, or badly designed, or that people are wrong for liking them, or anything like that. I'm just trying to explain what I don't like about them clearly enough for people who do like them to be able to say "Yeah, I can understand why you might not like that," without acting like I'm wrong for not liking them, or that I want all games to be super easy baby games or something.
Again though, that's not really a thing people on here do, just kind of the general feeling around discussion of the game in general.
Anyway, in my specific situation (I checked and it was Dark Souls 1), it was after the third time I died to the boss and felt no more enlightened about how I was supposed to approach it than I had the first time I tried, and was faced with making the boring run back to it, that I got frustrated and quit. That was just the trigger though, than the actual cause. Another issue was that up to that point I hadn't particularly enjoyed anything I'd done either. Like, it wasn't that I had thought it was especially bad, it was more that it just didn't feel especially enjoyable either, so there wasn't really anything drawing me to the game strongly enough to overcome the frustration.