Read all of the Dirk Pitt novels up to "Black Wind", after which I stopped, either through lack of time or loss of interest. I was very big into the Dirk Pitt novels, and picked up a ton of them at a sale going on at my library years ago. Really good series, though I think his writing quality declined after "Trojan Odyssey", and I really started to lose interest in the series after that.
Overall though, provided me with a lot of good times. He was really like the American James Bond in a way, except he worked at on oceanographic agency, something I had wanted to do until I got into college. XD