The sum of all fears is an exciting and suspenseful Tom Clancy rollercoaster ride, following the CIA operative Jack Ryan (played by Ben Affleck) — the same character from Tom Clancy's Clear and Present Danger then portrayed by Harrison Ford.
There's not a whole lot of character development. Instead, it's a somewhat fast paced race to prevent a nuclear device from blowing up the stadium during the Superbowl while uncovering a plot to bring Russia and the United States to the brink of nuclear war.
Ben Affleck's performance is pretty good, although Morgan Freeman is, at least to me, the more likable character. The fast paced and not really ever boring action is concluded with an almost-happy ending.
I can't really rave on and on about the movie, but it's a good flick worth watching.