This hasn't been my personal experience in either beta or live as an alliance player. I feel like I usually "win" most world encounters, unless they're rolling around in a huge gank-squad of 5+ players, in which case I've been able to successfully cobble together a group to fight them most times, or find good ways to fight back (like using the inns in Fallhaven to make a choke point).
To note, I mostly play holy priest/holy paladin, and will often be in the world with my husband who mains ret, so I know that's a pretty slick world pvp combination. But even so, getting a group together has been easy, and getting a bounty on you is a huge target. It seems to go back and forth very frequently between factions in any zone, even when I was messing around with wpvp on my arc mage (beta). No one holds dominance for an unfair amount of time.