Wesley R. Ball’s review published on Letterboxd:
Oh Kevin. You manipulative little jerk. You've managed to somehow slip your way into my heart and make me fall in love. Your parents should have talked about you sooner. Much sooner.
Lynne Ramsay's "We Need to Talk About Kevin" is a dark, brutal, brilliant film. It takes a scrutinizing look at an extremely disturbed young boy, it examines his childhood years, until high school when "the incident" occurs. It's like Boyhood, but this Mason needs to see a shrink.
Tilda Swinton and John C. Reily both give excellent performances as the parents of Kevin, who frequently clash over his increasing aberrant behavior. Whoever makes Kevin happy at any particular moment is the parent he wants around, and it almost always is dad. Dad is convinced that Kevin is the perfect boy, not swaying even after a series of "accidents" occur, which mom is convinced were all due to Kevin. Their clashes also escalate throughout the film, up to the incredibly bone-chilling finale.
I'm surprised that I haven't heard more people talk about "Kevin." It's simply a brilliant psychological thriller, and I was hooked from beginning to end. It really deserves more attention than what it has received.