>>389806228
Depends on how far and sweaty you are willing to get with it and if you have the specific autism required for it. I have put +1k hours in it in about 3 years and I play it almost daily. BeatSaver (the main repo for customs) has +20k human made maps with dozens of new ones uploaded daily.

The hard part is finding shit that you can actually play when starting out. For that you want to filter for "full spread" mapsets, which have all 5 possible difficulties done. The difficulty progression isn't consistent across different mapsets, so one mapset Hard diff most likely isn't comparable to another mapsets Hard diff. Not ideal, but this way you don't have to deal with mapsets with only Expert+ diff which are made by and for people with at least 200 hours into the game. After that it's just downloading bunch of maps and trying them out. There's also some competetive leaderboard mods with star ratings and rankings like ScoreSaber if you're into those.