Obviously I cannot speak about American designers and courses, but I think it is fair to say that the average standard of the British courses of the golden age of Colt, Fowler, Braid, MacKenzie, Simpson and Abercrombie was pretty fair. I might add Sandy Herd, Vardon and Taylor as well, maybe even Markes. You rarely find an uninteresting course by any of these. Of course, where changes have been forced on a club or a greens committee has sought to ruin a good hole or two for some reason not immediately apparent to us we may be disappointed on a first play, but given the volume of their work and the fact that on few occasions can the architects have supervised construction the average standard is high. How many truly great courses these people did is up to your perception og greatness.
There may only be one great novel in an author, but there are an awful lot of composers out there with a great many masterpieces to their name, Bach, Beethoven, Mozart, unquestionably, and it's then up to your taste whom else. For me, I'll add Schubert (for song, piano and chamber music only), Haydn, Stravinsky, Byrd, Tallis, Purcell, Monteverdi, Verdi, Puccini, Britten, Elgar, Tchaikowsky (in part), Rachmaninoff (again, in part). What, no Mendelssohn, Brahms, Schumann, Wolf, Wagner, Liszt, Schoenberg, Webern, Berg....? Well, if you asked me to write this list tomorrow it would probably be totally different!