I'm a major fan of Office Space, Mike Judge's previous major movie. So maybe I had my hopes up too high, but Idiocracy doesn't quite make it up to that standard.
The premise is that Joe and Rita are picked for an ill-fated suspended-animation experiment, by dint of their extreme averageness. They're supposed to be awakened in a year, but they're forgotten, and instead sleep until 2505. The world of 2505 is one where the intelligence of humankind has crashed, due to comparative overbreeding of, well, the stupid. Mike Judge is not a believer in the Flynn Effect.
So the world of 2505 is dumb, loud, and crude. Worse, it teeters on the brink of survival, as people have forgotten the finer points of technology and agriculture. Joe and Rita spend most of the movie trying to find the "Time Masheen" that will take them back to their own era.
The movie is packed with merciless satire on the habits and proclivities of the unintelligent. There are throwaway sight gags galore. It's just not much more than that.