Pandaren, Dwarves, and Trolls
undead for obvious reasons.. then trolls for the coolness factor.. plus they have tusks and voodoo magic.
Definitely Orcs.
Good examples are Broxigar, Saurfang, Grom Hellscream, Doomhammer, Thrall, Kargath Bladefist, Teron Gorefiend, etc etc. Heck, even Garrosh is pretty cool.
Damn, I wish Teron Gorefiend would return. He's such a badass character, it's a shame his role (and character model) were so lame in TBC. I really liked him in Warcraft II.
Definitely Trolls.
Theres even a quote back from Warcraft III :
"Dont mess with the bad guy!"
For the most badass looking race Tauren:
Big, Strong, Horns. you dare drink cow milk now or slaughter cows for meat, think again>_<
sorry, was I talking about 1 MINOtaur? no, I was talking about Tauren, from the WoW universe, not the Greek one. and if a human kills a minotaur in mythology, maybe a Tauren will kill a human in the real world, and i'm talking about physical strenght, not about equipment.
I dont consider beings that irradiate their own city (and before you bring up Pripyat, that WAS stupid, yes) and get a whole batalion devolved in an archaeological expedition as smart (not to mention that most of their inventions are useless trinkets). Should they appear in real world, they would be eradicated as a safety procedure.