Impressive vid, and as you say rather worrying.
I've run into two kinds of Rogues so far in PvP, those who know how to stunlock and those who don't. My Shaman dies horribly to the former and against the latter it's a close call due to the sheer storm of DPS but I can sometimes throw in a few tricks of my own and pull it off. Excessive amounts of stuns are the problem, not the DPS.
MMORPGs always seem to make mistakes with the rogue/assassin classes and overpower them in 1v1 and then make the excuse that it's a group game - trouble is, many people find themselves in 1v1 situations often and while assassins/rogues should be strong 1v1 they shouldn't be unbeatable (which a Rogue is in WoW if they get their stunlock off).
I think the problem Blizzard have created with the Rogue is a very high DPS class (did you see some of the crits in that movie?) that can also produce very long stuns. To me it should be an either-or, because it's no fun for anyone to play against a class that shreds you to pieces while you're stunned. Indeed it's not much fun being obliterated while crowd controlled in any form - damage should have a high chance to break all crowd control forms, be it stun, root, snare, frost etc. No class should be able to kill you while keeping you permanently locked down - how can that be a fun game experience for the victim to have no chance to fight back or respond.
Gouge and Sap are ok because the rogue can't damage you while you're stunned with those without the stun breaking. That's how it should be. It's the other abilities (like Cheap Shot) which allow damage during stun which cause the problem.
Vanish is an issue too. They should also make it so that if the Rogue uses Vanish they cannot attack for a period of time after (something like 10 seconds), because the whole Cheap Shot + stun + unload damage + Vanish + repeat thing doesn't help. Vanish should be for escaping, not setting up another attack from stealth immediately.
If they sort out the stuns and I think the Rogue will be more balanced in PvP.