1. Bomb and gouge doesn't work so well there.
2. There are some sharp contours on some of the greens, so the angle of approach matters more than at other links. It's an advantage to have played in a previous Open there.
3. The firm and fast conditions tend to even things out for the shorter hitters, as they get a boost on downwind holes, while the bombers' drives can get away from them.
4. Anywhere the wind blows, the guys who are old enough to remember how to control their ball flight have an advantage. It's not just Sandwich; consider Norman three years ago, or Watson two years ago. This should have held at St. Andrews last year, as well, but I'm afraid The Old Course is more vulnerable to the bomb and gouge game.