I liked his books a lot as a kid, but I eventually wised up to Clancy's hack-e-ness.
Red Storm Rising was my first and still favourite, but of course it's all predicated on the notion that the Soviet Union would, in order to gain control of the Middle East (something smart), pre-emptively attack NATO in Europe!! (something very very dumb!!!) WHY NOT JUST INVADE THE MIDDLE EAST!?!?!
aside// I've since read (forget where) a brilliant and infinitely more plausible and chilling alt-history scenario where the Soviets win the Cold War in the '80s by first dismembering Pakistan in concert with India: carving out a greater Afghanistan and independent Balochistan, leaving a cowed Pakistani rump. Assuming the West acquiesces to this fait accompli (not unlikely, particularly with the West blatantly arming the Afghan' mujahideen via Pakistan) the next step is attacking Islamic Iran on the pretext of Iraqi, Azerbaijani, and Baluch irredentist claims. Again, assuming the West doesn't come to the aid of the Ayatollah (that would be pretty difficult!!!), the Soviets are now in effective control of Iraqi and Iranian oil supplies, with the Gulf States likely to fall in line with a Soviet-dominated Middle East. The Soviets can now set the global oil price arbitrarily, and institute a Western oil embargo any time they want, and in so doing have effectively won the Cold War.
I also read most of the Ryan-verse books (Sum of All Fears, Executive Orders, Debt of Honour...) but they all blend together. I remember, in high school, when someone first mentioned a jet liner crashing into a building the morning on 9/11, I asked if they weren't thinking of a Clancy book (the one where the Japanese pilot crashes into the US Capitol; spooky in retrospect).
The last book I read was Rainbow Six, and I stopped reading Clancy book because it was so terrible. It made NO SENSE WHATSOEVER that the eco-terrorists would WANT TO ATTRACT ATTENTION TO THEMSELVES when nothing about their plan required it!!!!! (Just spray the god-damn people with the god-damn virus and be done with it!!!!)
My god, that's without a doubt the dumbest book I ever finished.