Well, I would specify a good functional language as one I enjoy coding in. So far that has been SML/NJ and Racket (PLT Scheme). For some reason I did not enjoy

Well, I would specify a good functional language as one I enjoy coding in. So far that has been SML/NJ and Racket (PLT Scheme). For some reason I did not enjoy F#, and I blame that more on the strangeness of the .Net libraries than the syntax of the language. Also it has been a year, so maybe the language has changed / I don't entirely remember all of the problems I had.