Survivor: Panama - Exile Island (season #12)
I considered this season one of the flukiest in that the most annoying people seemed to dominate the game instead of getting voted out at the beginning (admittedly, Cirie Fields eventually impressed me in a later Survivor season). The only player that I liked (Terry) made it pretty far only to get betrayed and eliminated after the final challenge. That reinforced my disdain for the unpredictability of the final challenge--and unfortunately, the expansion of a final two into a final three didn't start until next season. :(
Highlight: Rooting for Terry in individual immunity challenges.