Mitch Rapp was my summer read for 2010. I read Transfer of Power through Pursuit of Honor (10 books) back to back.
When The Last Man is released this fall I plan to read American Assassin, Kill Shot, and The Last Man back to back.
Even though Term Limits is not a Mitch Rapp story, I enjoyed it too. It was fun to go back and see Vince Flynn developing the stage and characters for his Mitch Rapp series.
I haven't read any Dirk Pitt stories yet. I've gone through the Isaac Bell and Fargo series and am half way through the Oregon series. Not quite Vince Flynn, but good stuff none the less.