Well, it wasn't a total waste of time. The characters were, for the most part, really good. There just wasn't much substance. It had a lot of potential, but it felt like they'd cut a bunch of scenes out, realised they'd cut too much, and then decided to simply stretch the ones they had left. Not much really happens. And some bits are decidedly random--the beginning and the ending, mostly. By the fourth time the car went round the race track, everyone was giggling, and I was waiting for a car crash so that the main character could break his arm in an exciting way. But nothing happened. He eventually stopped driving round in circles, randomly got out the car, and then the scene faded. (He broke his arm falling down stairs instead). Also, at the end, he's driving off into the distance, stops for no apparent reason, and gets off to walk into the sunset. Hmm.
Like I said though, the characters were good, and there were one or two gems in there. They were just few and far between. It's a relaxing film though, doesn't take much effort or energy to watch, and was a pretty good film for me to watch whilst knackered. Although perhaps I should have saved my 4 film ticket for another one (Nowhere Boy this week, and The Tourist next week, both of which look very interesting).
If somebody sticks it on in front of your nose, and you're feeling not particularly energetic, it's a reasonable film. But don't go getting all excited about it.