The movie itself isn't all that bad - it is catchy, rewards you with some tension and doesn't rely too much in hold-your-breath action sequences, as most of the present day thrillers do.
There are two issues, though.
First, and less troublesome, the plot. Nothing new, something of a mashup of Speed,Crank, and Phone. Booth. Really.
Second, and much worse, is the development towards the end - and the end itself. When the movie reaches its final sequences, there are plenty of moments when Liam Neeson's character could escape the situation, but he doesn't. The police response makes no sense at all. And worse, MUCH worse, is the ending, where essentially they forget all about how gravity works - the idea that it pulls you down, not sideways, and produce a completely unsatisfying end that leaves you with that feeling that you've just thrown 90 min of your life away (the worst thing is: this could be easily avoided, the director just decided to add a minute of tension, while making Newton and Galileo shake in their graves).
There are two issues, though.
First, and less troublesome, the plot. Nothing new, something of a mashup of Speed,Crank, and Phone. Booth. Really.
Second, and much worse, is the development towards the end - and the end itself. When the movie reaches its final sequences, there are plenty of moments when Liam Neeson's character could escape the situation, but he doesn't. The police response makes no sense at all. And worse, MUCH worse, is the ending, where essentially they forget all about how gravity works - the idea that it pulls you down, not sideways, and produce a completely unsatisfying end that leaves you with that feeling that you've just thrown 90 min of your life away (the worst thing is: this could be easily avoided, the director just decided to add a minute of tension, while making Newton and Galileo shake in their graves).