I see this is your first post on the boards. Welcome.
First off, for every bad post about any resort, there is an equally exceptional post about the same resort. Different people have wildly different expectations.
I heard the same things about the Polynesian before my trip in December. Rundown, outdated...blah blah blah. You have to realize too that no one posts on those outstanding experiences because there's not much to say. When you start a laundry list of all the bad things, then people start to talk and gossip and ask all kinds of questions so those threads stay on page 1 and "in your face", if you will.
We had a great experience at the Polynesian. As a matter of fact, if I hadn't bought into DVC last year, I'd have been to the Polynesian on my June trip and be going in November. We probably will go again at some point, but it's not for lack of love.
We were in Rapa Nui, admittedly one of the "newer" buildings - that's built in the 80s I think. We had none of the "smell" that supposedly people say is around. Nothing looked bad or "dated". It looked authentic to the Polynesian islands that are represented.
Go with the attitude that everything will be great! And it will!
One more note...The Polynesian has the highest return guest rate of any Disney Resort. *IF* It was truly a bad place to stay...it wouldn't have that statistic behind its name.
Enjoy your vacation.
(edited because I forgot that *IF* the first time around)