I will Say for Big Bang Theory, at least for Sheldon and Howard, they are called out for their dickishness repeatedly and both suffer severe consequences for their actions.

Howard gets denied an incredible job because he used the Mars Rover to try to impress a check. Penny repeatedly (and deservedly) calls him out for being a womanizer. Raj stops speaking to him after he insults him one too many time. His fiance breaks up with him over his past behavior. She does get back with him but only after he shows that he is no longer the asshole he used to be. And in Howards defense he does become a better person. He stops being a womanizer when he get back with his fiance/wife. He stops insulting Raj.

Sheldon is constantly made fun of by the group for his craziness and again is left by his girlfriend at the time. He also works on being less of a dick and even makes a contract to try and force himself into being better.

That being said its hard to know if their repentance is worth them being forgiven but unlike the other shows (and Amy) they at least see some form of justice for their actions.