Saw it today, holy shiiiiiit. This movie may not have much of a point, but it doesn't need one, it's just one hell of a ride. I left the cinema with nerves trembling. The whole thing was nothing short of exhilerating. I really don't know what other review cliches I can say, it was just really, really, really good.
Plot-wise there are numerous moments where some of the actions and decisions of the main characters would leave me thinking "oh come ON that is bullshit", but then it would be followed by some phenomenal piece of action and that made it all better.
One to definitely see in the cinemas, don't let your first experience of it be on DVD.