Protoss. They have Tank-strong ground units right off the bat. And by the time a Zerg person has Mutas, we have like 6-10 goons. So it is really an act of futility considering we built up a small force of zealots in the meantime. Then we attack you and wipe you off the map.

Arbs also kick ass. Recall is one of the coolest abilities, on top of the cloaking field. High Temps and their Psi storm, Darchons and their MC. Toss is godly. Plain and simple.

Mmm...butt-rubbin....Wait....wtf am I doing? God I am useless.