I think the more the actor lets you know what he thinks of the character, the less the audience cares - like a comedian who laughs at his own jokes.
“The art of publicity is a black art; but it has come to stay, and every year adds to its potency.”
“If I want to write a movie, I'll write a screenplay, but if I have an idea for a book, it's something that I think can only be done novelistically.”