There are many many ruby projects on the rubyforge site that have never released code. They still exist after years! and they come up in searches. There are those that are obsolete, broken, or with not one line of documentation that one has to download, go through source code to figure out what it does, and if it does anything at all.
When a person comes in to ruby he needs a starting page on ruby-lang.org that tells him the popular gems or frameworks for major uses: such as CLI programs, web dev, scientific computing etc. What some call a list of "blessed" gems/projects.
However, we cannot criticize ruby if everyone is writing his own framework, parser, templating engine etc. Its also hard to be critical that so much documentation and tutorials online are outdated/broken due to the constant rate of change. Either devs are not updating tutorials/articles, or google is bringing up older documents first.
When we see a high download count for a gem that still does not indicate that people are using it. It only means people have downloaded it to check out. DOwnload counts are deceiving. Gems that offer a very sketchy description and have NO webpage often get a high download count since that's the only hope of figuring out what it does.