Killing them Softly is a lurid and nasty little nihilistic hitman noir, with an ingenuity that sneaks up on you.
—Owen Gleiberman Entertainment Weekly
The film is terribly smart in every respect, with ne'er-a-false note performances and superb craft work from top to bottom.
—Todd McCarthy Hollywood Reporter
Uncompromising and uncommercial, divisive and brave, Killing Them Softly bitterly boils at the state of the nation.
—Kevin Jagernauth The Playlist
A bleakly comic, brutally Darwinian gangland saga that at times comes close to being this year's "Drive." It also does something that, if you're from around these parts, seems downright perverse. It takes the Boston out of George V. Higgins.
—Ty Burr Boston Globe
Even some who generally enjoy gangster films may be turned off by this one, with its focus on dialogue over action and its harsh style.
—James Berardinelli Reel Views