I think from a marketing point of view it makes perfect sense (though not too sure about the countdown timer!) as they're trying to show the company's products as a whole and more importantly how their products are used by real people. The most sophisticated gear in world doesn't mean jack if I don't know how to take advantage if it. A camera on it's own is useless without a vision of what you want to achieve. In a sense that's what flickr and other photo sharing sites are for me (and most other photogs). But other professions don't really have a source of inspiration like that. Admit it, you'd never try HDR unless you saw an example of it now would you? Some bloke makes a YouTube video on why and how and bam everyone runs out to buy a DSLR. (OK maybe not quite like that!) but you get my point.
And YouTube comments? Nothing but trolls. I've seen downvotes for some heartbreaking vids with nasty comments to match. Do you think Canon stands a chance against those trolls? If Aliens came down to Earth and based their opinions on humanity solely on YouTube comments they would (rightfully) think we are all a bunch of wormholes!
Unfortunately, people get all caught up, thinking Santa is real and is about to bring them a brand new present, then they lose all perspective and start lashing out when it turns out Christmas isn't here yet.
No worries, and thank you for this quote, it gave me a chuckle!