This is the trick I use too; but I found the result still isn't great enough for a few reasons.
1. People seem have a tendency to recommend products/brands that are niche or "in minority". Like some obscure ones that scratch particular itch for that user (and often expensive and hard to find). This is totally fine on its own, but you want to have the big picture (i.e. learn about the most popular ones) first when researching a new product.
2. The number of the answers is often so low (and most would have 1 digit upvotes) that it's very hard to judge when there is conflicting info.
3. People often just list the brand/name, without much more information.
4. you can't even sure if these answers are genuine (instead of marketing/soft advertisement).
Still, probably much better than anything else that can be easily found in general search.