Here's a very impressive short, animated film showing what would happen if gigantic robots were used in WW II. The humans looks real and the action is fantastic.

The short black and white propaganda commercial at the beginning is interesting too.
Watch it here:
Mechs in the II World War

It would be great if someone in Hollywood would make another movie like Sky Captain tried to do, but have it be just robots. Like Transformers meets Pearl Harbor. Then again, I'm still waiting for a remake of The Maltese Falcon done completely with robots. Speaking of robotic falcons...
"Robofalcons" to take on UK city's pesky pigeons