Just watched the Horde intro, and it's definitely not as bad as you make it sound. Garrosh talks about various races of the Horde (even blood elves, yes) and underline how important it is to find your role in the Horde. Also, he didn't clearly say that you had to kill your old friends that became Alliance. He just said they "died" when they put the Alliance tabard. That's more like, "Dude, forget them, they're dead to you now."
The event is actually quite nice, the only part that made me go "What ?" is when an orc tells Ji that Garrosh doesn't like to see non-orcs in a specific section of the city. (And the part where Garrosh yells "IT'S WARCHIEF !" when Ji calls him Emperor. That was unnecessary and made Garrosh look like a total douche)
Now, what I find quite unfair, is the poor choice of words used in the faction selection event, here.
http://imageshack.us/photo/my-images...yourdesti.png/
I think it's quite representative, but the words employed for the Horde text are quite poor. I mean yeah, they're barbaric and some races don't really appreciate each other, but still, they could do something a little less harsh.