I read some of his books. Not really something I would read all the time but it was ok.
I really enjoyed Ghost Recon 1, Splinter Cell 1-3 and Rogue Spear (I don't remember that much of the latter) but I cannot say that the latest games of the series really shine like the old ones (RS6V was not bad, but it was not that tactical anymore. Same for GRAW 2 which had some nice features (3 possible reloads for one gun <3) but the levels were too tunnel like and it lacked the atmosphere of the first game)
I would be interested, how much of the actual story is or was left in the games.