I really don't think Robin got robbed in Battle of the Sexes 2 since she really did suck on that mission (moreso than Tina and Sophia, the other two leaders) but Arissa was definitely a worse performer. Unfortunately for Robin, Arissa wasn't up for elimination.
Anyway, about Tonya, she's an idiot. I used to love her during Battle of the Sexes 1 and The Gauntlet, but she turned into a whore. I can't stand her now.