I have stayed at both POR and CBR and my family really prefers CBR. We enjoyed POR and would have no problems staying there again if we couldn't get CBR.
We like the Food Court better in CBR. Not a huge difference, but we really like the way it is laid out. Makes for splitting up to each get what we want and meet in the middle to check out.
The main pool at CBR is awesome! If you have little ones, the zero depth/splash area is wonderful.
The Nemo theme is great because it is kind of low key and not over the top.
CBR still gets some bad reviews. But I have found that the majority of them are from people who feel the resort is too big. Yes, it's spread out but that is one of the things we love about it. Even at full capacity, you don't feel like you are on top of others. It is so peaceful and laid back. It really does feel like you are on a tropical vacation which is a welcome change to the craziness of the parks. Even if you are at the farthest room from OPR and the Main Pool, it is an 8 minute leisurely walk. Most other non-preferred locations are under 5 minutes.
Also people have an issue with the fact that there is a bus stop for each Village. Again, we feel that this is a plus because there is never a huge mass of people at the bus stop. Even if you are the first stop picked up, you will be leaving CBR property in less than 10 minutes.
I have also read random issues with a room being dirty, broken shower, etc. But you can find those for even the Poly or GF if you look.