I would have never thought of England as 'underrated" or "flying under the radar" which is sort of how i personally interpretted the initial question.
I recently returned from a week or so in France (Morfontaine, Chantilly, St Germain, Fountainbleau, Golf National, Hardelot & Le Touquet). I find myself constantly shaking my head trying to work out how to adequately answer the question "Do they actually have golf courses there?". Still don't have the right words. I thought the courses, club atmosphere and accessibility were uniformly FANTASTIC. This country must be the biggest sleeper, I thought.
Then i realised that after returning from a week in Japan (Kasumagesecki, Kawana, Naruo & Hirono) about a year earlier i was doing exactly the same thing. I still cannot find a post round beer that tastes better than a huge Asahi after the obligatory bath....oh, and the courses were pretty good too!
What's more, a year before that after 2 weeks & 10 rounds in South Africa, i had exactly the same "under the radar" perception. In all honesty, I don't think any of the SA courses are in "World Top 100" category (by whatever measure) but many were spectacular, unique and lots of fun. The apres-golf options are hard to beat, though.
If Sweden & The Netherlands & Canada (quick preview there in 10 days!) are in the same category as the above 3, I've got to re-plan my next couple of years! Thanks for the opportunity to post (PS. This is my first post after a couple of years "lurking").