I'd really recommend watching this movie all the way through. It doesn't carry you all the way, so you need to have some preliminary interest(s) in the genres of this film, mainly parkour. If you are looking for a good parkour film, you're in luck and you should be pleased overall. Its also not bad for action, crime, or thriller genre-fans either.
The cast does a good job in their roles, though the script is fairly basic. The story-arc is intriguing throughout the majority, and while there are a few holes, I was left feeling content with the final execution. There is a very good amount of parkour-"action", so if you have any interest in this area, you should be well pleased.
I had no interest in the teen-drama aspect of the film, but the other aspects of the film allowed me to endure this weak point. They were probably trying to appeal to the female, Taylor Lautner fan-crowd on the romantic aspects of the story line. This is the first film I've seen him star or co-star in, and I will say that he did a decent job. It looked like he did a fair amount of the parkour moves himself, so he has my respect for his dedication to training for this film.
If you are a fan of District B13 movies, the video game Mirror's Edge, or just a parkour enthusiast in general, I really think you'll enjoy this flic overall.
