This is the height of presumptuousness given I am a rank amateur when it comes to architecture and mediocre at best when it comes to golf. But is it is the holiday season so I trust that you will be forgiving.
For me a course that equally balances appealing to the intellect, challenging our golfing abilities, and moving our spirit is the pinnacle of success. For me, Lahinch, CPC, North Berwick, and PH2 have met that test. Each has a the kind of variety of holes that stirs one's intellectual interest, demand enough of your game, and have a wonderful flow and relationship to their setting.
To try to make my point, there are some great courses that do not quite achieve that balance for me. Royal Dornoch hits Body and Spirit (big time for Spirit), but I thought there were too many similar holes and a less than stellar finish to get the Mind aspect quite right. The same with Ballybunion which also is awfully difficult as it relates to the Body aspect.. Bandon Trails meets Mind and Body for me, but does not quite rise to the heights regarding Spirit (perhaps unfair because of the inevitable comparison to the settings of the other three courses). Pasatiempo and Woking fit into the same category. No course is too easy for me, but as much as I loved Golspie and Kilspindie, some probably find them lacking regarding the Body aspect.
Ira