Don't know if these have been posted before, but this guy explains the issue perfectly
He gave the warbringer turbo tagging and swearing to eachother the perfect name... Lil'bitchitis. I do admit that on day one I went mental with the tagging aswell. Was able to outtag most players (aka everyone except for hunters and their traps) till I got my first mount. After that I just invited players, went at impossible times (if I woke up at like 3 AM for some reason and couldn't sleep anymore I would go farm them) things like that. I'm a proud owner of all 3 the direhorns they drop, so I know the frustration of the groups there.
Had a few people try to reset my warbringers, but thank god I am a DK. Tons of taunting, pulling and freezing kept them pretty close to the spawn ^^
Best of luck to all other mount hunters out there. It is a pain, but the mounts are worth it!