By this point, my eyes will have glazed over and I'll be trying to remember which of my alts are unguilded and unknown so I can play in blessed peace and quiet. But sometimes it makes me wonder... why do both sides feel that the other is dominating in battlegrounds? Does either side dominate in battlegrounds? And this afternoon, Kalgan has hopped on the forums to provide an answer to my question:
...generally speaking the win/loss percentages for WSG, AB, EotS generally fall somewhere around 55% to 45% on any given day (with Alliance also represented on the higher side).... AV has gone through greater swings, with alliance winning as much as 75 to 80% of battles (NA servers again as an example) before patch 2.2 and horde winning about 60% so far after 2.2.
When asked about trends over the past month or year, Kalgan replied that they were about the same. Much as I suspected -- a lot of winning and losing is a perception issue.