Though it's not mentioned in the patch notes here, Wintergrasp now has a new mechanic. Apparently, on some severely unbalanced servers *cough* Demon Soul *cough*, even a 20 stack of tenacity on Alliance players 24/7 is not enough to guarantee them a fair shot at getting VOA on a consistent basis. When they did manage to get it, it was usually very, very early in the morning.
Imagine my surprise when I decided to queue for an upcoming WG, I zoned in, and I was the ONLY person in the raid group for 20 minutes. I had a few fights with the apparently only Ally in the zone, a druid named Xime, and while his moonfire spamming killed me a couple times (me in my PvE gear at 29k health, him with 3 stacks of tenacity and 39k health), I did manage to get a few kills on him as well.
I had decided to stop trying to take the Broken Temple workshop and instead go for Sunken Temple, when it showed he was finally trying to attack Flamewatch Tower. Goodie for me! I had just gotten to lieutenant by doing a little npc kill farming, so I quickly rode back to Broken Temple, hopped in a siege engine, and putt-putted my way up to the south-west wall of the keep. Just then, another Horde joined the raid, and a matching Ally paladin named Jcr came over the wall and demolished my tank.
I tried taking a demolisher straight up from the Westspark workshop to the front gates, but with only about 2 minutes left when I got there, we didn't get the front wall taken down after dealing with the druid's patrolling siege engine.
It would have been epic, though!
So, Wintergrasp is now strictly enforced with balancing teams, as well as tenacity.
Ahh, I searched a little more, and found the source post.