It was in 3D which basically uses alternately polarised projection of the left right views of each frame so that a pair of specs with appropriately polarised lenses filter the frame so the left eye sees left and the right eye sees right and you get 3d, more or less. There is a little ghosting, probably partly due to the cheapness of the polarising filters, and the more extreme the 3d projection they are attempting the more noticeably the effect breaks down. Still if you sit more or less central you get a pretty good 3d effect.
The 3d thing is a gimmick and one that these CGI films get away with as a by-product of their process, to be honest it doesn't add much you notice it a few times mostly when it first kicks in and in a couple of the set pieces but for the most part it just means you are wearing a fairly uncomfortable pair of spectacles while watching a film.
Anyway the film itself follows the adventures of Flint Lockwood (voiced by Bill Hader) a hapless inventor whose creations either don't work or backfire in some alarming way. His latest creation is a machine that turns water into food and through a series of events it ends up embedded in a rain cloud thereby making it rain food. The power hungry mayor of the town Flint lives in sees an opportunity he can exploit and manipulates Flint for his own ends, there is also a love interest in the shape of a weather girl Sam Sparks (voiced by Anna Faris) who is out to make her career on the weird weather the machine creates.
It carries a fairly strong walle style criticism of excessive consumption and the throw away consumer culture. With food just raining from the sky all the time people gorge themselves and also a huge literal left over mountain is created. It's not too preachy though and the message doesn't obscure the entertainment.
There is some depth to the film as well with some fairly detailed characterisations more so than you'd usually get in a kids aimed animated film. Flints technophobe father (voiced by James Caan) who can't relate to his son, talking in fishing related metaphors which his son doesn't understand. The brainy nerd weather girl Sam Sparks who hides her intelligence behind a ditzy blonde façade to be popular. The town cop (voiced wonderfully by Mr T.) who's a typical bad arse cop but also shown as loving father and thoughtful and steadying influence on the town as the film pans out.
The voice cast is very good with people like Mr T and Bruce Campbell (as the mayor) giving the film some wonderful performances. The visuals are also pretty top notch with some great shots of food related weather, the spaghetti tornado is particularly impressive.
It's a fun film with some good comedy moments and plenty for all the family to enjoy as they say.