Sick, sometimes sadistic, always sarcastic humor and lots of parodies of children's shows. Not meant for my son's age, but he's mature for his age and has a very friendly and empathetic personality. I remind him often that these characters are not good to imitate.
What can you expect from Mad the cartoon?
"crap", "turd", mild offensive humor about poop and doo doo and other gross things. If you are strict about violence or language, you might want to watch this and screen it before letting your kids watch. My son is 8 and the violence factor concerns me.
Also, the way death is treated without much regard is something to think about. There is an episode with the dog Blue from Blues Clues dying and another episode with some old guy who passes away on his birthday but they shrug it off and instead celebrate his birthday with the dead guy lying there. There is a parody of the movie 2012, which concerns me because my son is now worried about the end of the world.
Also, in one of the skits, there is a bully hamburger that gets a kid in trouble and snickers about it. In another episode a greedy superhero who blows some kids up after getting money from them. Bad role models, but all in the name of humor.
If you do let your kid watch it, make sure you talk to him/her about the content of the show so they dont try to emulate the behavior of the bad role models and situations.
PS, dont tell your child that there is a magazine for Mad unless you feel they are ready to read the magazine. In my opinion, the magazine is way too mature and meant for young adults, with its references to drinking, and I dont want my son reading it until he's in his late late teens.