Videos should only be used if they explicitly add value over other forms of content.
Some examples of videos that don't add value:
Video format sideshows of pictures set to background music. - No no no, this is stupid, just post the pics and let people browse them at their own rate.
Video format presentations - No, it doesn't add any value over a text article, and reduces accessibility. Perhaps acceptable if it complements a text article, but the text must be the primary/default content.
Examples of videos that do add value:
Live band gigs
Entertainment shows, tv, etc.
News coverage of events where it is good to see the event. - Should always be accompanied by textual content
Visual content that is required to demonstrate something - Such as a brief demo video that accompanies an article.
I often open up a site like digg.com and open up multiple articles to read, then go through and read them. I do not care for sites that auto start a video or slide show before I am even on the tab. The content doesn't bother me, its the starting without me!
It really depends. A site such as YuTube obviously needs video as main content. Channel9, on the other hand is completely pointless - I want to read technical information, not watch someone talking about it.
The gripe I have with videos, besides the bandwidth hogging, is that they take an excessive commitment to the content. Commitment I very often don't want to give - so the tab is closed and I move on.
Being of a generation that can still read and comprehend (with a substantial attention span), I'd like to do just that.
When referring to internet content, I think it is a rare occasion that using video (instead of text) is other than actually rude, for it's rare, indeed when anything substantial is added by the typical (over) use of this medium - except, perhaps, for a substantial waste of time.
All of the above, by the way, isn't even referring to the atrocity of video-ads.
This, by the way, from a person with a rather strong visual orientation.
"The difference between genius and stupidity is that genius has its limits." - Albert Einstein
"As far as we know, our computer has never had an undetected error." - Weisert
"It's a sad state of affairs, indeed, when you start reading my tag lines for some sort of enlightenment. Sadder still, if that's where you need to find it." - Balboos HaGadol