I don't know if it's the Poly that just brings this sort of "NO IT DIDN'T and if it did, it was your fault," out of people or what, but you cannot say a cross-word about the place!!! It sounds like you enjoyed your stay but mentioned a few things which could be better. Fair enough. I stayed at the Poly last year and we enjoyed it but there were things we didn't like or we thought they could do better. You would have thought I said, "Anyone who likes this resort is an idiot!!!" What the heck??? It's a hotel, folks. It's nice, some people love it, some people like it, some people dislike it. It really doesn't matter.
We were on the Luau side during our stay, too. The OP is right - it's a mass exodus when the luau lets out. If we stay there again I will stay on the other side of GCH. I, too, found the rooms to be dark in the closet area, and people do tend to congregate by the bathrooms. None of these things ruined my trip nor did they ruin the OP's trip. Just a statement of facts as I saw them.