Not writing ratings yet, we were just talking about it. nostr:npub149p5act9a5qm9p47elp8w8h3wpwn2d7s2xecw2ygnrxqp4wgsklq9g722q is totally against them. I'm not, I think it's a short way of expressing an otherwise written opinion (plus its low friction). 

I would use NIP-32 (on a NIP-94 file metadata) for rating a release. I don't think it's equivalent to rating a whole repository. First because it's fine grained (release) and because it's the actual product the user is using. The repo is way more general and upstream.