I'd actually be tempted to go with Troll. Regen isn't that great, but Beast Slaying, Berserking, and Da Voodoo Shuffle are nice.
Orc Axe spec is super nice when you can find a good axe weapon. That's 5 expertise you can reforge into something else. Hardiness is also kinda cool.
Tauren pretty much have endurance. I can't remember the last time I saw a Tauren war stomp in PvE.
Undead pretty much only have Shadow Resist. You'll never use WotF in PvE.
Goblins have that 1% permanent attack speed increase, which isn't terribad. Rocket Barrage might be a good pulling tool.
Really, though, in the end, I'd go with whatever feels the most fun to play. I happen to like the way my Orc looks while tanking. I prefer undead for my rogue, and I love goblin for my hunter. It has more to do with looks than gameplay, because the racials aren't game breakingly different in power.
Kathy, I said, "I'm lost" though I knew she was sleeping
I'm empty and aching and I don't know why
Counting the cars on the New Jersey Turnpike
They've all gone to look for America