Cold? Nolan's films are full of emotions!
Even if they think it's real at the end.
Also The Prestige, the only one of the main characters you can say for certain is a good person is Michael Caine's character. Who you side with depends on who you are. There are two defining emotions in the Human condition; Love and fear. And Nolan's films have covered them both very well, in many ways that most filmmakers these days fail to.
Off-topic, I agree that Fincher's films feel cold, to the point where it feels like a machine made them and performed them. It led to me not giving a **** for anyone in The Social Network.