
You can browse all the existing RCRs, and read the comments, without registering at RCRchive.
On the top page, just scroll down. You'll see the current RCRs in various categories. You can also retrieve the legacy RCRs from Ruby Garden. (Matz has declared these obsolete, but they're made available here for reference.)
When you click on an RCR and it is displayed, you can also click on the name of the person who submitted it, and you will get links to all the RCRs written by that person, as well as all the RCRs that person has commented on.

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