It seems like the older generation that probably was exposed to Aquinas in Catholic colleges takes his brilliance for granted. I did not have that benefit. I'm a cradle Catholic who followed a circuitous path through various philosophies, beginning with Milton Friedman/economics/libertarianism then to Rand and a general study of various modern philosophies until arriving at Aristotle and then Aquinas. I truly appreciated his work after having wandering in the arid desert of modern philosophy for so long.
I think my situation is analagous to the many Catholic reverts who must go through a Fundamentalist stage before returning to the Church with a greater appreciation for Her.