Very good. Back on my vanilla realm you would have a 50% chance of running into the op horde premade that stomped all the pugs. With the addition of crossrealm the chances of getting stomped reduced dramatically, making pug pvp enjoyable. Same is probably true for the occasional horde pug that faced my alliance premade lol.
Also combats queue time issues and makes queue dodgeing almost impossible. People who whine about this didnt play vanilla. Sure its sad to not see your nemesis in every bg but people actually being able to play pvp is more important..