That top 10 list of challenge 'atrocities' was a great summary of some of the more memorable malicious and ridiculous challenge moments.
I am rooting for Jenna and Brianna- they are self-deprecating but they are good competitors and team-mates. I like the narrative arc of Brianna not wanting to be there and then turning that around and trying hard in the challenges. They don't insert themselves in other people's drama, have funny comments that aren't hurtful about other people and in general have an endearing sweetness to them.
I think Cory is pretty adept at sussing out group dynamics and figuring out the politics of the game. And Mitch, like other folks have said, provides a good counterbalance.