Philip,
Sandwich definitely has a lot of blind shots, which is probably one reason why some great players do not love the course. Compared with other Rota courses, I am guessing it has more than its share of blindness. However, like Simon said, I did not think its blindness was unique compared with many great links courses. Any time a links has the dynamic land that Sandwich has, it should have that many blind shots.
Compare it with Deal, which has blind completely blind shots on 3, 5, 6, 13, 15, and 17, and obscured shots at 2 and 16. That is 8 holes to Sandwich's ten, and Sandwich has much more tumultuous terrain than Deal. Simon, if you want to talk links courses with blind or semi-blind shots, how about North Berwick! 1, 3, 5, 13, 14, 17 for starters. Prestwick has at least 9 holes with blindness. Yes, Sandwich has a lot, but not that much when compared with other fine links.