Duke: I am fully aware of how the internet is so much more than text.
But on the other hand, one cannot forget the simple fact that any tool that can be used can also be abused. When .gif animations arrived on the scene, what happened then? Or to put it another way, who is not thinking that
This Strong Bad email didn't describe just about every single home-made webpage for several years?
And to add in Youtube videos that are more or less irrelevant except to make a punchline is, in my opinion, equally useless as putting in a .gif flame. You're technically taking advantage of the tools of the internet, but there is no actual benefit coming out of it. It breaks the flow of the review when I have to stop reading the review and click a link just to see what the hell is going on in the head of the reviewer. Once or twice I've ended up forgetting about the rest of the review, and then popped over to another webpage before eventually coming back here and realising I never finished reading that review. Is that really what you want?
I would of course welcome relevant videos, such as those showing some actual gameplay, but they seem to be in a distinct minority here.
So, make it flow. First and foremost, make it flow. Text might be an old medium, but it's still fricking damn powerful, so be careful about how to supplement it with other tools.