Good author. The key was that he obviously did a lot of research in preparing his stories. Granted, not all of his writing was perfectly accurate. But, so much of it was that you, as a reader, gave him a break when something wasn't right. I remember reading in Clear and Present Danger when he said that 2" revolvers were no good past 10 feet. I laughed because the closest I ever shoot for practice with my J frames is 21 feet, and more likely 30 feet.
That said, Clear and Present Danger and Without remorse were my two favorites. I re-read Without remorse last summer. Still great.