The Curse of The Godfather (Films).
This article was from 2010, but it brings up good points since I just thought about it today. Actually, now.
http://ezinearticles.com/?The-CURSE-of-The-Godfather&id=4997011
In addition, they didn't bring up FF Coppola (I know, not an actor, but he's an important part) and De Niro. They less said about their later work, they better.
*EDIT*: Also, Diane Keaton too. Her later work isn't too good either.
DR. DOAK BITCH!
http://i.imgur.com/UFHT7.jpg