I think so too, but then I think about review spam, spoofed listings, and all kinds of other misaligned incentives that reviews attract. I think if it were as good as HN is on average, it would be an interesting subsite, but the mods and the users create something special on HN scale. I’m just not sure a HN review site would get the love it needs to be better than mediocre.
All that said, I’d still read it for the comments.