I recently read this (mostly flattering) review of Lush.
The review starts with "This is the best Lisp I have yet used" with
flattering comments. The same review also says "this is also
the UGLIEST Lisp I have yet used". I could not agree more.
Lush was not built for elegance, but as a tool for attacking
large scale machine learning problems. We want it to get
the work done and stay out of the way.
Our sympathic reviewer is puzzled by the fortran-like
qualities of CLush. This comes handy for heavy
numerical calculations. During the last seven years,
a CLush program has been reading about 25,000,000
check amounts per day! (serious: see .)
 Yann Le Cun, Lon Bottou, Yoshua Bengio, and Patrick Haffner, "Gradient Based Learning Applied to Document Recognition," Proceedings of IEEE, vol. 86, no. 11, pp. 2278-2324, 1998. Downloadable from <http://leon.bottou.org/publications/index.html>