Lucy
Okay, first, let me just say I'm sort of morally obligated to see this movie, because it was filmed in Taiwan.
Secondly, yes, the premise is dumb and scientifically bullshit. No denying that. Also, you can't ever ignore the premise, because it's not one of those premises that are just mentioned and then forgotten. No, this is mentioned and discussed and used as a plot point through the whole movie. So you have to suspend your disbelief for it. Wasn't too hard for me, to be honest. I saw it much like genetic mutation giving people psychic powers. Or a school of magic being reachable through platform nine and three quarters. Or a portal in a wardrobe leading to Narnia.
The rest of the movie's fairly interesting, I think. It tries to raise some questions and themes that artsy philosophical types of people will have a field day with. ScarJo gives a competent performance, although admittedly most of the movie only calls for her to express robotic detachment. The visuals are nice, too, and Luc Besson is more than competent when it comes to direction action sequences.
On the other hand, though, Luc Besson likes to insert action sequences when they're really not justified. There's a car chase scene in the middle of the movie that's way too long and way too pointlessly destructive. Lucy's use of her powers are also incredibly inconsistent.
Finally, some lucky Taiwanese actor got paid to stick his hand down the front of ScarJo's shirt. Seriously.