yep even itself and thats the point most warriors are raging about
For good reason, too. All stuns sharing dr=having your gap closer share dr (and incur dr for all stuns as well). This is very bad for warrior viability over, say, a deathknight.
IMO they should make the charge stun an incapacitate, so that every charge doesn't make the target dr'ed on further stuns. Of course, this would make it impossible to blink out of charges...oh, that would just be awful!