So the 40K Dreads are laughably silly - if they'd lift a leg they'd fall over and never be able to get up again - and Titans are far too heavy to ever be useable. But are there any piloted mechs that you know of from a game or book series or whatever that would be functional in the real world? That is to say that it doesn't just look cool, but it would serve some sort of actual military purpose and do it better than, say, a tank or a gunship.