IMO Makosi was the greatest gameplayer, she made 3rd place and made fools out of all of her housemates.
Jason did nothing, he was actually carried by Victor who was the more active gameplayer and when Victor left, he only got carried by Victor's fans to second place. Victor was a great gameplayer but Jason deserves little credit. But Makosi operated alone and played everyone like her little pawns, and made it to the end with her own fanbase behind her.
And I guess Makosi should be mentioned as one of the most two-faced people as well, but she was brilliant.
Grace was a good player but unfortunately lost out because of the unfair chanting. Nick wasn't much of a player, all he did was write on pieces of paper. He didn't actually follow the rules of the game neither, so he wasn't a great gameplayer at all by not sticking to the rules.