I remember that fact particularly infuriated a friend of mine, who over the course of vanilla did nothing but PvP, although at the time that meant basically running around Southshore and Tarren Mill. When the honor system was introduced, there was a contest held by Blizzard for those who engaged in PvP, and the top characters on the realm who got the most amount of honorable kills were rewarded with a special tabard. My friend spent weeks in Tarren Mill, happily murdering Alliance until his fingers bled, and he won his tabard handily -- after all, nobody really did as much PvP as he did. Then the Battlegrounds came out.
When he stepped into Battlegrounds, he discovered that despite the fact that he did nothing but PvP, he couldn't hold a candle against those people who engaged in raiding. The gear and weapons that they got from raiding were too powerful. And that's when he threw up his hands, said he didn't want to have to raid to be good at PvP, and promptly stopped playing the game.