I can't speak with authority on OCaml or Haskell, but Common Lisp isn't lacking in terms of libraries. You just have to know where to look (http://www.cliki.net) and how to manage them.
And one last thing. Is functional programming really better than imperative programming? All that brain-racking to implement a multi-level loop using recursion in ML? IMO, imperative programming cleanly maps out to the real world. The world is imperative!
"LISP embodied a much greater leap of imagination. Conceptually FORTRAN remained on familiar grounds in the sense that its purpose was to aid the mechanization of computational processes we used to do with pen and paper (and mechanical desk calculators if you could afford them). This was in strong contrast to LISP whose purpose was to enable the execution of processes that no one would dream of performing with pen and paper." - EWD 1284
I would argue that if one needs to know where to look and how to manage them, then CL _is_ lacking in terms of libraries. One first has to know where to look and find a CL implementation then to know where to look and find batteries for it.
I disagree. The months or years you will spend learning a new language dwarfs the hour or two you may spend learning where the packages are and how to install them. These arguments are more relevant at the entry level (PHP, etc) but someone learning their third or fourth language should have less trivial considerations in mind than how nice its implementation of CPAN is.
Sounds like you don't want Lisp then. Lisp is the battery. It's the ultimate freedom of choice. Use libraries from: your friends, a coder you respect, or write your own.
You don't complain about not knowing where to look to get a Linux distribution do you? Freedom leads to fragmentation, but the fact that there are a million Linux distributions doesn't make Linux any less powerful.
If you want an Ubuntu, don't use Lisp. More power to you. Some people just want to get the job done quickly with at little thinking as possible. I know I feel that way sometimes. But if you want an Arch, where you built the system from the ground up, then you want Lisp. And at the end of the day when something breaks, you just might know how to fix it. ;)