DRUID – Tauren are the only race on the Horde able to be Druids. They make great Druids too. Alchemy is a very common Druid tradeskill and the increase to herbalism, which accompanies alchemy, makes gathering a lot easier. The increased health is great for any Druid, especially when tanking. War Stomp is a quick cast stun that lasts long enough to get a fast heal off, or a quick escape.
HUNTER – Tauren make decent Hunters. War Stomp is great to let you get an Ice Trap down to freeze the target. The health increase is good on all counts. Nature Resistance isn’t especially practical. Cultivation is good if you are an herbalist, but it’s not common for Hunters.
SHAMAN – Shaman is a good class for Tauren. War Stomp lasts long enough for an extra heal without interruption. Alchemy and Herbalism are great Shaman tradeskills, and Cultivation helps. Nature Resistance is minuscule. Maximum health increase is always a powerful ability.
WARRIOR – Tauren is a great race for Warriors. Extra health helps all the time, especially for Warriors. War Stomp can interrupt healing enemies and put the nail in their casket. Alchemy is a fairly common tradeskill for Warriors, who get no real buffs.