How many of those user perspectives are real? It seems to be if you are a manufacturer of a certain product that it wouldn't take too much effort to promote your product with a few sock puppets in a subreddit until your product is on the subreddit's shortlist of recommended products. From that point on new users to the community will evangelise your product for you and you can scale back your sockpuppets.
If you manage to get your sockpuppets to be admin of the subreddit it's also not too hard to delete negative comments or reviews about your products or to generally steer the discussion in the direction you want it to take.
I don't trust reddit product reviews anymore than a top 10 SEO site on google with top 10 best <product>.
True, but I always take in information from many sources. As I type this I'm sitting next to my no name bluetooth headset from some Chinese company I have never heard from before and it's worked flawlessly for the last 6 months. I found reviews from Reddit, Amazon, Online forums and even one person who has a blog. I found enough of what I consider actual users experience. Especially on Reddit people will comment and generate back and forth conversations that give me confidence that I'm not wasting money on something that does not suit my needs.
It may not be perfect, but in Reddits case you can see a users comment history as well and if they are active on other subreddits not dedicated to a single product or set of products. Redditors also tend to overshare information about themselves, so, you can really tell who's a user and who's not. I could be wrong but it takes more than cat pictures to fool me.
I don't trust reddit product reviews anymore than a top 10 SEO site on google with top 10 best <product>.