When I was in a Catholic seminary, we were taught that the "proofs of the existence of God" didn't work very well as proof, although they did tend to prove the possibility of the existence of God. Our professors generally had a high opinion of Thomas, but claimed that he had been "dumbed down" by lesser minds through many centuries of "Thomism." Thomas had one virtue that was missing in all of the centuries of Thomistic scholars that followed him - Thomas had doubts.

-Joe-