This is true, look at what people in the 50s and 60s thought the year 2000 would be like. Hell Star Trek was closer than the scientists and companies back then.Well he's not wrong in his assumptions of this being a disappointment. We have only just garnered a glance at this device.
It is not unheard of for Microsoft or any company for that matter, to show off a groundbreaking device and only have it be too good to be true. It is fully justified to be skeptical.