Saw 2012 over the weekend. I got exactly what I expected out of it: Completely implausible, intelligence insulting good time. Fantastic special effects, acting you don't buy because they're not actually seeing the digital effects they've been pasted into, and everything that happens is completely impossible. 
 
CAUTION: SPOILERS BELOW

Here are my main problems with the movie:

1. Nutrinos. They made up crap about nutrinos because they apparently didn't want to consult with any scientists to find a more plausible cause for the disaster. Earth Crust Displacement theory is fascinating, and should've been fine by itself, without the nutrino nonsense.
2. Hollywood.
   A. If there were one more scene where the heroes barely manage to outrun the destruction thats speeding along right behind their vehicle of the moment (limo, plane, RV, plane again, bigger plane), I was going to puke. They outran a pyroclastic flow in an RV. Pyroclastic flows go as fast as 450 mph. They did things in a limo that would destroy a hummer. Its a good thing that all the places they needed to get to happened to be in a direction AWAY from the destruction.
   B. The usual contrived romance.
3. The obvious. They eventually wind up in a cargo plane full of cars. They talk during their entire trip in this plane about not having enough fuel to make it to China. At one point, they're preparing for a water landing because they're low on fuel. It never occurs to them to drop the many tons of cars out the cargo hatch in order to make it MUCH further with the fuel they have. It does occur to them, however, to use one of the cars to escape the plane as it is crashing. On a glacier. In the Himalayas. Lucky for them, it was the smoothest, widest, most crevasse free glacier in the history of glaciers. The plane, of course, came to rest perfectly on the edge of the glacier, hanging over a precipice of a thousand feet. Of course. Then our heroes, dressed for southern california, from whence they'd just come, are shown casually strolling at the bottom of the precipice. It's not important, apparently, to explain how they climbed a thousand foot sheer cliff face, in arctic conditions, with no climbing gear, dressed in LA casual clothing, at night. They never even acted like they were cold.

Listen, I'm usually really good at suspending my disbelief and getting into a story, but this one also asks that I suspend all common sense and intelligence, as well. I just couldn't do it. The special effects were awesome, and if you like seeing things destroyed, you'll like the movie. But, it wouldn't have been hard to make it much, much better. I'm giving it 4/10 because, even though it's terrible, it's still fun to watch.