It's good not only to realize that you can't please all of the people all of the time, but that you don't want to. There's a certain type of reader that you don't ever want to write for.
Well, I think certain roles are chosen for us. The moment I read Pete Campbell I thought: I can do this, this is mine. And in Money, too. The truth is I turn down a lot of projects. If a character doesn't have some kind of internal struggle, it's no good for me.