Went and saw this last night. I thought it was as good as Hunt for Red October in the Jack Ryan series. It had the epic quality to it that the other two didn't quite reach. I was a little leery of a younger Jack Ryan, but Affleck does quite well, I thought. They also changed the plot from the book, but the changes work. At least they kept the major plot point in (Think Superbowl) which Harrison wanted cut if he was going to do the picture.
I liked how the scene changes used satellite maps. It reminded me there's ALWAYS somebody watching.
The part I didn't like was the Hollywood slo-mo run with the flames spouting up behind him. Very cheese.
The Godfather-esque sequence at the end raised my eyebrows a bit as well. Not bad, just...odd.