It'd be interesting to hear what you think about Rich Hickey's work on Clojure. Things that surprised you in a good way, and things that you think it got wrong

It'd be interesting to hear what you think about Rich Hickey's work on Clojure. Things that surprised you in a good way, and things that you think it got wrong (i.e. things that won't be on the surviving main branch). I'm sure other lisp programmers would like to know your thoughts on this since Clojure has got itself quite a reputation in the last five years.