I don't think strlen is being accurate by saying its "Ruby fanboys" who are the source of a lot of criticism. Clojure does have a lot of former Java developers who aren't used to non-IDE development on the JVM. Others don't like the apparent complexity Emacs comes with (Emacs, Slime, Swank, Paredit? All I want to do is enter some ascii characters and run a compiler!) That said, I think Clojure is improving in those fronts with broader editor support, guides to getting Emacs set up, and a growing list of libraries.