I was a big fan of Earth's Mightiest Heroes. This new show is good, and I watch it, but it seems to be a bit campier (the Avengers fight over cookies in an early episode, Hulk is revealed to collect glass figurines in the same one). With that out of the way, the review, ladies and gentlemen.
Violence: Superheroes and villains trade titanic, city-wrecking blows every other minute. Manhattan is constantly leveled and rebuilt as the characters fight with fisticuffs, lightning bolts, magical hammers, laser beams, missiles, bullets and arrows. No blood is seen, but characters are usually put in visible pain (screams, groans, etc). Captain America seemingly dies at the start of one episode, and Iron Man does the same at the end of it. Black Widow is turned into a vampire, the Avengers are mutated into versions of the Hulk and turn on each other. The series is still in progress, so this will change. Sex: Black Widow wears a tight outfit, and tackles Hawkeye in one scene, sitting on his stomach to keep him from rising as she explains the latest supervillainous situation to him. Drinking, Drugs, Smoking: Not much to speak of. Language: None, some insults are traded ("hey, ugly!").
I still suggest Earth's Mightiest Heroes over this series. But, it has its moments. Hopefully my review will help you decide.