Actually pretty good. There's some very low budget acting and effects. But since most of the film follows Paul Walker soloing as Nolan, a man who has just lost his wife while she gave birth to his daughter. Set during the huricane Kathrina, at epicts the struggle to survive against all odds and keeping a fragile new life ending.
As said the production value is not super, but it's super cool to see Paul Walker in a role, where he really gets to shine, compared to the more action focused Fast and Furious movies.
If you want drama and tension this is a good flick, and you even learn a little about how some people experienced one of the worst natural disasters in recent time.