Seems to me that Steam itself fits well into this category. It tracks your overall play time for games and has a recommender system, and also keeps global stats

Seems to me that Steam itself fits well into this category. It tracks your overall play time for games and has a recommender system, and also keeps global stats for a _lot_: https://store.steampowered.com/charts/ https://store.steampowered.com/charts/