Jandy Hardesty’s review published on Letterboxd:
Really enjoyed it - Luc Besson's crazy sensibilities usually mesh with mine pretty well. I thought it was really interesting that as her mental capacity increased, her empathy decreased proportionally. Sort of the opposite image of Leeloo in The Fifth Element, who almost couldn't go on with her mission after being overwhelmed with emotion when she saw the embattled history of humanity. Leeloo is essentially a god confronted with humanness, while Lucy is a human who becomes god-like. Of course, Besson's "god" is essentially impersonal, which I don't agree with, but it's kind of an interesting starting point for a discussion.
Mostly, though, it's just cool, as Besson just about always is. The one quibble I'd make is that it would've been great to have ScarJo kicking more physical ass before going all mental. The visual of her just lifting all the thugs off the ground and walking under them down the hallway was cool, but a full-on Oldboy-style hallway smash-em-up would've also been cool.