Like cdrn1 wrote, I never get requests. I stopped making them, no point in bothering. I used to try, but after about five trips with no requests ever granted, I got the message. Nowadays I decided to forget it and just let randomness rule. And it didn't matter if I checked in early or late, or if I was polite at check-in, or even the couple times when I nicely asked for another room, the answer was always sorry - we can't change your room. So nowadays, I just quietly accept whatever they assign, and I always mentally prepare myself for a room in the farthest corner of the resort near no pool, bus stop, or food court. And usually it is. Sigh.
But for some reason, POP always give me great rooms. Wonder why it's my favorite resort!