Because I have nothing to do, here's a breakdown of the remaining contestants in the order I'd give my vote out:
1. Spencer - He's been dominant in challenges, and he's played a great social game. Kass is the only person he got in a feud with, but that seems to have died down in recent episodes. His strategic play is as good as it can possibly be from where he's been most of the game. There's not much decision making to be made when you're constantly at the bottom, but I think making it to the finals from the bottom is a much greater achievement than being the deciding factor of who's voted out.
Grade this far: A+
2. Tony - He's been great strategically. He's been the one to vote out everyone on the jury, except for possibly Trish... we still don't really know why he voted for her. He has been okay in challenges, nothing to complain about, nothing to write home about. He gives each challenge his all. His social game has been the downfall of his game. He's burned bridges with multiple jury members, and they could hold grudges.
Grade this far: B+
3. Woo - He's played an okay social game. He hasn't burned bridges with anyone, but he also hasn't made any notable relationships. Strategically he has been a non-factor. He's been Tony's puppet most of the game. His most notable reason as to why he should win would be his challenges. He's won individual immunity, and he always gives his all. On the brawn tribe he was a big factor as to why they would always win. Another notable achievement for him was when he stole Spencer's idol clue. He caused chaos and made it known there was one out there and most likely in play.
Grade this far: C+
4. Kass - She has played an okay strategic game. She has been in power, or at least the majority alliance, most of the game. Her most notable accomplishment was shifting the power of alliances with her flip. She's been awful in challenges, never even coming close to winning individual immunity. She was a big reason why the Brain tribe didn't work out well. Socially she was playing a decent game up until she decided she had to become the villain of the game. Since then she has played an awful social game, burning alliances and relationships with nearly everyone on the island. Grudges remain intact, and there's no way she goes home with a million dollars. Her comments and gestures (giving the bird to Trish, etc) have been seen by the jury members, and they will not soon forget about that.
Grade this far: D-