I didn't have any great expectations about In Time and after a quick glance I just learned that most critics would agree with that stance, but I have to say it turned out to be quite entertaining. For a movie that seems to base itself around a gimmick it's set up surprisingly clever with some genuine hints at the real world, including the modern "time is money"-mentality, the house of cards that is our economical system and how both the rich and the poor seem to be in perpetual self-maintaining (somewhat vicious) circles. Not everything's executed extremely well and of course some subjects are a little chewed out by this point, but the writers were perfectly aware of that and dose it just right so that it never seems to put too much focus on these things, instead leaving them for exactly what they are (details on the sidelines) while spending the majority of its time (harhar) on what is rightfully its core business: simple action. The story's definitely not weak and does what it has to do, but it is too weak to carry the movie by itself, so a supporting role feels very natural.
The movie has great potential for being a giant punfest and sure enough it quickly throws one pun after another at you - however instead of feeling like trying too hard, a parody of itself or even just misplaced, it blends into the whole well enough that it's properly dosed comic relief. After all the entire movie portrays a slightly warped world, where cars seem very advanced (my petrolhead housemate and I agreed that they sound very much like a turbocharged engine without an actual engine - I suppose that's one way to portray electric engines) and people have successfully modified human biology but cellphones or indeed any wireless technology of sorts seems to be mysteriously absent. On the one hand this is a tad bit odd, but on the other hand it makes you feel that little bit out of touch with the world that it becomes easy to excuse other strange elements such as the duality of the concept of time by blaming it on something along the lines of artistic license. (I'm inclined to use the same excuse for their portrayal of travel times, because even for a movie bending 'time' it's just unnatural that at first it seems to take hours to travel across 12 'zone borders' whereas towards the end it turns into a matter of minutes.)
So yeah, it has its flaws. I guess the characters aren't particularly deep or likeable, and sometimes it's a bit unclear whether they want you to think of the Timekeepers as good or bad guys, but to be honest that's quite alright. It's not a great movie, but it's certainly entertaining, and for something that takes a spin on the ancient ideas of both immortality and time as an instrument it's a refreshing enough take to excuse the fact that it may not make perfect sense all the time. No pun intended.
On a side-note: in the group of musicians-gone-actors, Justin Timberlake is one of the more likeable people that I've seen make the transition over the last few years. He's not stellar by any means but does a good job considering the overall track record of the music industry in Hollywood, and he manages to make his characters that slight bit more likeable than the character design allows.