I have Gilneas and AV on the black list, when grouped with other guildmates, it changes to Isle and Strand. To defend bunkers is interesting with mates.
IMO, players chose the BG who likes to play, not for the wining ratio. I always queue for AB or Eye when it's call to arms, but for AV? Never. It's too old, too long, and too often pvp fighs have 1-10 proportions.