A well-crafted action movie that is unfortunately bogged down by its ridiculous premise, Lucy would be far more enjoyable had it just dropped its silly "10% of the brain" premise immediately. Instead, we have to spend way too much time with exposition, as if Besson is trying to convince both his audience and himself that this is really a thing, you guys.
Bring your brain down to 10% usage and enjoy it for its well-crafted action, and superb acting from Johansson and her nemesis Choi Min-Sik.
While not a shot-for-shot remake of the comic, it is still as visceral and visually striking as the source material. We're not privy to the machinations of the vampires this time around, but that doesn't make them any less scary.