quite good, considering that it is a Besson movie..

Rating: 6/10 (18 February 2020)

This could have been much worse, considering that it is a Besson movie. It's not a 10/10 movie, but if you take it for what it is (an imaginative Sci-Fi french movie), then it's quite good.
the basic idea is well developed, after all, and the key behind it is told when Lucy says that the only measure unit in the universe is Time. Everything else is a construct of our brain. That's why she is able to move through time at the end of the movie. It's so blatantly evident but still some of the big-brained bad reviewers seem to have missed it entirely. Probably they were already sit in front of their computers ranting while writing a bad review.
still, the movie has many defects though being quite enjoyable. some Star Trek movies are considered far superior but they are much more stupid than this one.