I'd like to see the same actor play Ryan over the course of 15 years or so. The Jack Ryan career story arc is pretty interesting and would benefit from seeing the same actor mature into the different roles as Ryan ages/advances.
I like Chris Pine, too, but I haven't seen any of the Jack Ryan movies, except for The Sum of All Fears, which stars Ben Affleck.
I likes, that was the worst one too. You gotta watch Hunt for Red October, Patriot Games, and Clear and Present Danger. Or just read the books, they're much better.
Not the greatest told story, and certainly not one of Branagh's best direction. Actors perform well-enough given a script shot through with holes, and this time Kevin Costner isn't annoying. However, none of the philosophical nuance that was threaded through Red October is present, and be prepared for the story to advance with you left behind. The audience is not taken along for a ride; mostly we are dragged behind on a rope by a freaked-out horse through shrub-land.