It's all about the ego... Although you don't realize it till the end. Highly recommend at least a one time watch. He wrote it in response to "Fight Club" 

 The only one I didn't care for was rocknrolla.

I remember him doing an interview where they asked him why he didn't write female characters, and he straight up said, "because I don't understand them." And that movie proved it. Female lead made no sense at all.