Peter Debruge, who reviewed John Wick for Variety, said the following:
…there are some great actors working alongside Keanu Reeves in his darkest and most tormented role yet: a stunningly lethal contract killer who goes on a rampage after a Russian thug murders his dog. Yes, his dog. If you can stomach the setup, then the rest is pure revenge-movie gold, as Reeves reminds what a compelling action star he can be, while the guy who served as his stunt double in “The Matrix” makes a remarkably satisfying directorial debut, delivering a clean, efficient and incredibly assured thriller with serious breakout potential, thanks in part to Summit’s simultaneous Imax release.
You can read the entire review here.