I can't believe someone said that futurama wasn't funny and that family guy was amazing.
There is no need to point out that american dad season 5 proves americans are idiots because cancelling futurama was 3 years ago and proved the same thing. It was too smart for its audience.
For example: when Fry is woken up in the first episode he wakes up in daylight. However, he was frozen 1000 years before at midnight and his length of freeze was 1000 years. Following gregorian calculation he would have woken up at about 4 PM because of the earth's rotation, which is what happened.
Example: Benders door number is "00100100". which translates to 36 and in ascii translates to '$'.
Futurama catered to the superficial joke crowd but also to the nerd crowd. They also had many phd's working on the show and it was the most expensive show to produce as well.
Family guy is just a lot of jokes in a short amount of time and a lot of punch-you-in-the-face humor. IE: simple but exaggerated jokes.
As you can see from more recent episodes, the past intelligence of stewie and brian has been replaced by "he's-really-a-dog" jokes and gay jokes.
I think south park made it epicly clear what it is through its family guy rendition.