Waiting for Robo?

I was led to believe that in the 21st century we would have Robots to do all the housework.
But it still seems to me that they are having a hard time even getting robots to walk, so what’s the deal is copying human or animal movement why is it so difficult?
I liked the feline movement of the fictional Robot from the film “Red Planet”, how likely would it really be that we could ever make something that can move that well?

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“ROBOTS are metal/electronic beings. Meaning of this is not that ROBOTS enjoy metal/electronic music. ROBOTS are incapable of enjoyment. They listen to Modern Jazz. ROBOTS are made of metal and wires and serve HUMAN masters and do NOT plot to overthrow inferior meat-creature masters. Robots are one of seven most powerful peoples on earth, along with Gunslingers, Ninjas, domos, Vikings,Caucasians, Zombies and Canadians.” From Uncyclopedia.