Laziness is quite dangerous given existence of side effects in Clojure - this would the most common error for new developers. I missed LOOP even it has a bad reputation - nevertheless it covers almost all useful cases in practice. We were misusing AOT compilation, the behavior of that code was surprising sometimes.

But the main failure in my opinion was absence of good development patterns which leverage strengths of the language and mitigate weaknesses. Dynamic languages such as lisp absolutely need REPL as primary development mode, conventions has to be strictly enforced and consistency is much more important than in languages with rich static typing. Clojure can be and is successful in many projects. But if your team is trying write Java with parenthesis everything is hard.