Golf World's 2002 listing of the top 100 courses had 24 from Scotland, 21 from all Ireland, 6 from Wales, 48 from England, 1 from Isle of Man. They had a large panel of judges (including Peter McEvoy) who scored against maxima of 40 for quality of test and design, 30 for visual appeal and enjoyment, 20 for fairness and presentation, 10 for ambience and history.
You'll be glad to know that neither The Belfry, Celtic Manor nor the new course at Gleneagles (all past or future Ryder Cup venues) made it into the top 100. The K-club did, however, at 79th, Mount Juliet is as high as 51st, Druid's Glen made it in at 77th.
5th highest Irish course is The European (21st, after RCD [2], Portmarnock [7], Royal Portrush [
, Ballybunion Old [10]) and close behind is Waterville at 23rd, ie above Co Louth [27], Lahinch [30], Co Sligo [44].
England is light in the top 10 with only Royal Birkdale [5] and Woodhall Spa [9] but is well represented in the teens, 20s, 30s and 40s.
Scotland packs the top order:
Muirfield [1], Turnberry Ailsa [3], St Andrews Old [4], Loch Lomond [6], Carnoustie [12], Kingsbarns [13], R. Dornoch [15], Gleneagles King's [17], R Troon [20].
The course you really need to know about is Castletown, the IOM's only representative which lies a respectable 82nd.