I have not seen this movie, but let me explain why you shouldn't

Rating: 1/10 (2 August 2014)

First of all, people CAN access 100% of their brains, just not all at once. Look up "10% brain myth" if you don't believe me.
So, right out of the gate, you have to your suspend disbelief to enjoy this movie. In addition to this, the way Lucy is portrayed in the movie is probably not very accurate.
1) Because Lucy is using a large portion of her brain a lot, she needs lots of energy. I have not seen any commercials with her eating a Big Mac in order to keep her brain running at peak performance.
2) Her brain would more than likely overheat from functioning at such a high level. I haven't seen any ice packs on her forehead in the trailers.
3) She would probably need an IV (for fluids and nutrients) and a catheter to maintain her on-the-go, demi-god lifestyle (in addition to a feeding tube).
I'm sure there are lots of other issues with this movie. Personally, I want nothing to do with a movie that insults my intelligence and the audience's intelligence.