This isn't very useful IMO, because Reddit (and subreddits) are echo chambers. I can't comment for every category, but good examples that I am familiar with are

This isn't very useful IMO, because Reddit (and subreddits) are echo chambers. I can't comment for every category, but good examples that I am familiar with are Cars, Coffee, and Vacuum Cleaners. Without deep diving each case, I can say that certain product mentions in these categories are basically guaranteed upvotes because those subreddits' primary readers are biased towards particular brands or attracts a particular kind of person. The love of the MX-5 Miata and the Aeropress are good examples here -- they are both very niche things loved by a very particular group of persons, but I would never recommend either as a general answer to "What car should I buy?" or "What coffee maker is the best?". They are specialized products for specific kinds of people. Many of the other categories I glanced at look similar. Also, pianos doesn't make sense, as the Piano subreddit isn't about buying pianos, it is about playing music and learning to play. There aren't even any actual acoustic pianos recommended!