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There's a German robot named Robotinho that cruises around on 4 linked Roombas, operating as a tour guide at the Deutsches Museum Bonn. I would be terrified to follow it around from exhibit to exhibit, as its awkward facial muscles twitched into unnatural expressions and it spewed out museum facts. The robot apocalypse is upon us, and it's riding on Roombas.
I don't know why they give robots human-like faces. The uncanny valley theory says that the more human it looks, the more obvious its flaws are and the more freaked out people are by its appearance.
I think a face like Wall-E Short Circuit's Johnny-5 would cause fewer nightmares.