I watch them mostly for self-indulgent reasons, so I don't think a non-gamer would enjoy many. The main reasons are to preview a new game before buying, to reli

I watch them mostly for self-indulgent reasons, so I don't think a non-gamer would enjoy many. The main reasons are to preview a new game before buying, to relive a childhood game, see the end of games I remember not completing, or to watch someone go through a game I've finished and see how they react to various situations. Depending on the game and streamer this can be entertaining for different reasons, such as their personality or skill level. On the last point a recent one I enjoyed was Joseph Anderson's Undertale blind playthrough. The game is notorious for throwing unexpected meta-narrative about games, gamers, and even stream viewers, and seeing a critic encounter that where he didn't expect it was entertaining. It also has a very difficult boss as "punishment" for certain choices you make on a typical third playthrough, and he definitely proved himself as a competent gamer when it only took him a few hours to beat that encounter. I could hear the change in tone as he got quiet and entered the zone and knew it wouldn't be long. Like all Let's Plays though it is long and probably best viewed while you are doing something else.