Disappointed in the winner
In the first two seasons, the winners were not the first to discover who the mole was. Charlie pegged Kathryn right off the bat, and Heather used process of elimination to key in on Bill. While they were first, they were not the only ones to discover the identity of the mole. Stephen and Jim figured it out pretty early on making Stephen a respectable winner. Dorothy, while not figuring it out on her own, still used her knowledge to get rid of Al and get to the final 3, needing only to beat Heather at a memory game to win the quiz.
Mark, however, literally had no idea who was the mole until the final execution of Paul. And even then he made a gut decision (Craig) instead of a logical decision (Nicole, at least from his standpoint) and got lucky.
I can't imagine how pissed Paul must have been as John went through and pointed out all the times Mark was just seconds from execution. On top of that, Paul would have made final 3 had it not been for the last exemption, since Mark still had no idea that it was Craig. It also kind of trivializes Paul's game, since so many players had no clue (Victoria, Kristen, Clay, etc) but can say they played well since they tied the winner.
As much as I hated the two players, I would have much rather seen Paul or Nicole win over Mark. At least they played as shrewed detectives who drew suspicion away from their mole and onto themselves. And the producers must have been kicking themselves when he gave that confessional early on about how Craig is the perfect mole since he's so likeable. He saw right through their ploy.
Mark may have played a better game than I'm seeing, but it just seems like he meticulously took notes without direction, got insanely lucky, and then took a guess.