That is true only if you use bleeding edge clojure (EG. 1.1.0), clojure 1.0 docs are very mature. And since 1.1.0 is a developper version at the moment, it appears quite illogical IMO to complain about the state of documentation.
They're mature, but they are also not very good. I still spend ages digging around trying to figure out what should be relatively simple stuff. The documentation around ns in particular is difficult to navigate.