I've stayed at three deluxes (Poly once, BC many times, WL once), one moderate (POR twice), and one value (POP, once, on a unplanned solo trip while stranded in Florida due to a car wreck). The Poly is my favorite, for many reasons, but I feel I do have to say a good word about the POR. It's a really nice resort. The POR's theming is not so bold as the values, and might appeal to adults more than kids, but I really did prefer the POR pool areas and the larger food court to that of POP's. (Nothing against POP--the values really are a great value, and I enjoyed my stay there.) The landscaping is beautiful and it's got a nice peaceful feel to it that you don't get at a value, where the focus is more on constant activity. Also, the bar and Boatwright's are a lot of fun.
We're staying at the Poly this month, and feel it's totally worth it for what our family wants out of a Disney vacation, and we're all so excited to be going back, but I would stay again at POR without hesitation.