Well,
2012 starts out okay, and they try to have a sense of story and logic, but there is a definite line of demarcation where it's pretty clear the flimmakers just said "golly it" and the whole movie turns into a bigger mess than Roland Emmerich has ever produced before (and he's made some seriously shitty movies).
John Cusack's reticence about accepting the role starts showing through his acting ability. He literally has a "what-am-I-doing-in-this-movie?" expression for about the last half of the film - which is a whopping 2 hours and 40 minutes long. After they'd already destroyed the entirety of civilization, and when what's left of humanity gets to the 'special destination', I looked at my watch and there was still at least another 40 goddamn minutes of the movie left! But don't worry, they filled it with one of the cheesiest, most implausible moments of tension ever put to film.
We sneaked into
The Fourth Kind afterward and it was a masterpiece by comparison...
Actually,
The Fourth Kind had some really creepy things in it...