The Great Houses of Westeros all had their good and bad moments on Game of Thrones, but there was no family quite as despicable as House Lannister of Casterly Rock. They were rich, manipulative and playing the long game for the Iron Throne. But by the Old Gods and the New, they looked good while doing it.
Source:https://www.cbr.com/house-lannister-game-of-thrones-books-differences/