Accountant is a self-contained action thriller with franchise potential!
Ben Affleck plays a math savant (read autistic) hero-for-hire. His acting was understated and engaging. Props to the screenwriter and director for believably developing this character and putting him in a techno-thriller-corporate-espionage movie for the 21st century. They also left the door open for sequels, but I commend them for telling a cohesive three-act story - unlike some other entries this year.
By no means I could say that this is a must-see movie. But it sure is entertaining with interesting characters and story, and also a very well-choreographed fight between Ben Affleck and Jon Bernthal - or Batman vs. Punisher!
As one of the few good action movies of the Fall season, I'd give it an 8/10!