To a certain degree, blaxx is right. Rob only won because most of the players were DUMB-ASS FOOLS. However, a large chunk of the reason why only dumb-ass fools remained left in the game near the end is because Boston Rob got rid of the smart ones early. Rob knew exactly who to keep and who to get rid of.
But I also agree that this season was UNFAIR. WHY should Russell and Rob have come back in the first place? That was really unfair to everyone else. Russell and Rob came in with HUGE advantages. But then we're back to the argument where these DUMB-ASS FOOLS didn't get rid of them (well, one).
And I don't think Jeff Probst was an orchestrator at all. If anything, this season his commentary chose words which made him seem like a fan of Rob (which he obviously is).
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle