Personally, the embedded YouTube usage across the web is annoying. I understand it, but it is still very annoying to me for 2 reasons.
1. It appears lazy. If someone has a point to make, make it. Don't just slap a YouTube video there.

2. YouTube is blocked by the firewall at work. I admit I browse a lot at work, but usually when waiting for processes to finish or during breaks. It sucks that I am increasingly unable to contribute to discussions because I can't see what the heck everyone is talking about.

CJSF

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Two years ago moved from my town
I was looking up past the city lights
But the city lights got in my way

See the constellation ride across the sky
No cigar, no lady on his arm
Just a guy made of dots and lines

-from "See The Constellation"
by They Might Be Giants