Re: The computer that 'lives on your head' will change mankind
So far, I'd rate it "almost but not quite entirely useless" (don't ask why I have one).
I have to say that many would have said the same about the first mobile phones: They were big, clunky, only worked in certain areas etc. Same with cars: They didn't go very fast, were very limited, heck a horse or horse-and-cart/carriage (or even walking) was a much more convenient way to travel.
I'm not saying that Glass will become as big as the mobile phone, but remember it is a very early example of technology. I don't doubt it is pretty crap as things stand, and most people shouldn't be interested in owning/using it, but that doesn't mean it will never succeed.