My view is that they will because of the large area and high number of spread out mobs in the 1-6 area as well as plenty of hidden away grinding spots in the 6-10 area. This combined with the lower class pool and the fact that they don't share the starting zone with another race, should result in lower numbers in that area.
This gives Tauren a high chance to tag mobs early on and try to get a jump on everyone else to reach large quest hubs like the crossroads.
What are your views, tricks and experiences?
When Barthilas opened I played an orc warlock and I managed to get lucky with some tags, moved to 6-10 area at level 4 (after training) to kill some lvl5 scorpids and managed to stay ahead of the pack in durotar, I would kill absolutely anything that had a yellow level after that, no matter what and i managed to get first to lvl20.. But the tagging to get me to level 4 was pure luck, so i wouldn't like my chances if i tried it again in the Orc/Troll starting area. I was tagging up near Sarkoth and I think that the only quest i got done was the boars before abandoning the rest when i left at level 4.