And his thoughts in retrospect: "I wrote these a long time ago. I was much more naive then about the craft of software engineering, so proceed with caution." http://www.defmacro.org/
For what it is worth, his articles about Lisp are among the things that got me interested in Lisp, and I still like Lisp.
http://www.defmacro.org/ramblings/lisp.html