In general, I find the ham community to be supportive and encouraging. The eham.net link ratings seem to be an exception. There are far more 1 ratings than I can really understand. For example, AE7Q is incredible resources that I find myself coming to over and over again, but it has six 1 ratings. The site has tons of features, and it does a good job making them accessible.
I think they can be useful, but not in all cases. Reviews with a small numbers are utterly useless. Reviews with a couple hundred reviews can be useful. Even then, you have to read the review and use discretion.
For example, the Icom 746 and 746pro. If not for the reviews, I would have never known about IC-151 or the backlight issues. Those were useful. However, there are rah-rah reviews that seem no more than advertisements. Then there are reviews that are well written with detail about pros, cons, etc.
Worst is, I have seen reviews of products that people gave zeros for, and they did not even own or have in their possession, and even admitted so in their reviews. And then there are pissing contests within a reviews, which end up with followup reviews.
I have even learned and gotten better at writing and reading reviews. There is one major flaw. You cannot edit a review, or change your mind a year later. You have to enter a new review.
So, my advice, is like a nice HF rig. Handle with care, and try to read the detailed reviews.