These kind of comments are really dismissive. Sure, MS PR did fire up the hype train a bit too much, but in the end they only want to show what it will be capable of in the future, as they are not selling the current version to consumers yet.

Pretty sure it will eventually reach that level of the E3 presentation when hardware gets faster/smaller/cheaper, by now it's just a tech demo and they have a lot more to actually show than Magic Leap for example.