We stayed in 3 different rooms in December (2 resorts). The first two rooms, we did online checkin. Fabulous rooms, good locations (in our opinions).
Third room we didn't do online checkin. Horrid room, awful location. Had to be switched the next day. For the third room we also checked in later, around 6 or so? And I believe we got the bottom of the barrel, rooms-wise. I feel if we had done online checkin we would have probably been assigned a better room (and hopefully someone less picky would have gotten the room we got).
For that first room, I was allowed to make a request, and it was on the reservation. I requested a first floor because of my aunt's knee problems, and that's what we got. Maybe it's changed for the negative since late November (when we checked in), though? I wasn't allowed to make all the requests I wanted, but I did get that one in!