I've been fortunate enough to play two of Doak's 10s, Pinehurst #2 and Royal Dornoch. But aside from the TOC, my experience with anything between 5 and 9 is virtually nil. Consequently, I have serious doubts about my exposure to quality golf and my ability to rate architecture except for the extreme examples.
I first played #2 when I was a much worse golfer and had no experience of quality courses. But I recognized (viscerally?) that #2 was something special. My longest tee shots weren't necessarily my "best" tee shots. Hitting the green on a par three wasn't a guarantee of anything good happening from that point on. Being off the green ten yards from flag was sometimes a much harder shot than being forty or fifty yards or even a full wedge away. It was my introduction to angles.
I have read a lot since then and I have discovered this site which has truly furthered my education in the past few months. I don't know if skill is as important as imagination. I have played with players who hit shots I can only dream of, but having seen those shots I can imagine how they apply to a golf hole. The same thing applies to the short game. Often when playing a good golf course that presents interesting green complexes, if I am by myself I will try different shots in the short game (I miss a lot of greens) to "work" the green to my advantage. It's not only fun but it's educational and makes one a better player.
There is an argument to be made for holes that present a straight forward challenge, but a course made of nothing but this type of hole lacks variety and would, I think, become "stale, flat and unprofitable" in time to most players no matter their skill level. Give me a hole that begs/demands/teases me to put my ball in a different spot depending on the conditions and I am having more fun even if I can't get the ball to the spot. Defeating the hole from the wrong place can be the most satisfying accomplishment of all. However, if the player confuses the result with the proper line of play, more often than not, the hole will thrash him.
Tom MacWood mentions intelligence and analytical skills as assets, and I believe they are; but I also think it is a specialized intelligence that recognizes land forms and their possibilities. The level of skills will depend on aptitude and how that aptitude is enhanced by exposed to and experiencing architecture. But it's not experience if you don't remember it nor if you don't integrate it. I think this applies to golfers have the technical but not the analytical skills. A really good ball striker who shoots at sucker pins is going to run into a lot of trouble, and if he doesn't understand why he's running into trouble what does that say for his potential as a rater. If he thinks he's being treated unfairly because he missed his target by five yards and is in a world of hurt while a fellow player takes the safe line and misses his target by twenty yards and is able to salvage a better score is a lucky SOB, then how will this affect his opinion of the course or hole? More important, how valuable is his opinion ultimately?
I have played a lot of courses that would be 1s and 2s on Doak's scale, but even in these cases there are always some interesting features. I enjoy discovering/recognizing these features and learning from them, and the difference between a 3 and a 5 or any other ramp up or down the scale is the number and variety of these features. If you can recognize them on a non descript muni you can recognize them on one of the greatest courses of the world. But if you don't have the experience and exposure, if you have played nothing but 1s and 2s a 5 could be your first 10 because it's so much better than anything else you have ever played.
The bottom line to me is that no matter one's potential as a rater of architecture, until that person experiences a wide variety his opinions are going to be parochial and of lesser weight than someone who has "experienced" quality architecture.
I don't know if I've contributed anything of value to this thread, but I feel better for having written it. Of course, the same can be said of a bowel movement.