So stop playing the game. If you're not having fun, don't play. That's what games are for.

It's a world event, join in and have some fun. Kill the zombies, or join them. If you're not having fun, it's your own fault.

Also, if you're complaining about people killing battlemasters, they take a whole 1 minutes to respawn (zomg, I know that must really eat into your ALL DAY of play time,) and they're generally leaving them along outside of Orgrimmar, on the horde side anyway. Go to a deserted capital city, or go to the battleground entrances themselves (barrens/ashenvale border for WSG, for example.)