Most people say that you shouldn't use lisp because it doesn't have libraries. Well they are only half right. You shouldn't use lisp, because most lisp libraries have very little documentation. Lisp has a lot of libraries. You have to be willing to read code (i.e. examples/tests) to figure out how to use them.

http://www.cliki.net/Library

Assuming that the most precious commodity is development time. I'd say rails/django don't even come close to UCW in getting stuff done.