Agreed - I haven't seen the others, but I liked The Accountant. Something appealing about a guy who is quietly very very good at what he does. I also happen to have a low-key thing for Anna Kendrick... Several of my favorite scenes are: when he first shows up at the farm house and is setting up for some target practice. Farmer says "Not on my best day..." then Ben proceeds to go 3 for 3 cold. A great "Oh s***, who is this guy?" moment. Another is when he finally kills the bad guy right in front of the farmer & wife, then smiles and waves sheepishly. Funny. As. Heck. Finally, when he takes out the assassin in Anna Kendrick's bathroom without making a sound - his being quiet and focused all through that fight just raise the hair on the back of my neck.
The Accountant is my favorite Ben Affleck movie (not a big fan generally, although I found him better than I expected as The Batman).
I considered his portrayal pretty realistic for a high-functioning autistic person. As a nutritionist, and as a math/science nerd, I have interacted with autistic persons, have gotten along with them well, and have gotten to know some of their common traits. (I also thought Please Stand By, with Dakota Fanning, pretty realistic; some autistic viewers certainly thought so.)
I discovered I really like Anna Kendrick with that movie. (I worked backward to Scott Pilgrim.) My opinion is: If you want great comedy, then get a great actor. I think she is a legitimately serious actress who often happens to be funny.
The common passion for arithmetic analysis humanized Affleck’s character; he actually became briefly spontaneous with her, and did not react negatively when she slugged him in the arm in camaraderie.