It depends on a few things. It depends on who did the review or the quality of the review. There are certain reviewers on here that have very similar tastes as I do. I know if they think something is too weak that I will too. If they give something three vrooms, it comes off my list.
If it's someone I don't know, then it just depends on the quality of the review. If there's not a lot of info in the review, it doesn't really impact my decision. If there's no info on that person's personal preferences (so I know if we have similar tastes), I give less weight to it. So if someone just says "four vrooms" but doesn't compare it to something or say "I like strong vibrations," I pretend that they didn't rate the strength at all and wait for another review.
It also depends on the product. If the design of something is just really pretty, sometimes I get dumb and buy it even if all the reviews suck. I'm drawn in by pretty things!