Delayed response, but there’s a few that I’m aware of that may roughly fit this interest.

!buyitforlife@slrpnk.net

Same idea but different instance:
!buyitforlife@sh.itjust.works

Lastly there’s !recommendations@lemmy.world, but this is more for seeking product recommendations rather than providing reviews of products. However currently there’s nothing in their rules prohibiting product review posts, so you could always DM the mod to see if they’re open to them.

Edited & crossed out first couple communities as I reviewed the original thread and saw they weren’t what you were after. I also see that you’ve made a community tailored to what you were looking for via !product_reviews@slrpnk.net, which is apt. Best of luck with it!

I’d be interested in that. Kind of like an open-source Consumer Reports.

I’d love to have that here. I’m not aware of a sub-lemmy though.