C3PX said:
As for the no obvious reason part, I am going to have to assume your computer doesn't have sound... the Darth Vader knock off narrates and explains that the Sith have been waiting to take down the Jedi for three hundred years, growing in strength while the Jedi grew proud and lazy.

I have sound. I just find:

Not-Vader: "We've been waiting to kick you asses!"
Nameless Jedi: "Bring it, bitch!"
Not-Vader: "Attack Sexy Fettette!"

to be perfect for a trailer, but it's not a compelling story. It's not even a story. It's a few badass lines of dialogue. Just because a short (admittledly awesome) game advertisement does what it's designed for, which is make our geek blood boil for 90 seconds, I'm not exactly enthralled. The Phantom Menance had some awesome trailers too.

KOTOR 1 was awesome. KOTOR 2 was markably less so.

I dont do MMORPGs, so ultimately I'll never know, but just because this ad has a checklist of things I Pavlovianly drool for (Vader, Fett, boobs, lightsaber fighting) I'm not ready to declare it anything more than a really cool looking commercial.