I think this totally depends on what YOU want.
For me, I always request non-smoking and non-handicapped. Anything else, just depends on my mood when I make that ressie. At BCV, I have asked for pool view and Epcot view on differing occasions.
One person's "bad" view is someone else's "perfect" view.
Doc is right that the more you request, the harder you make it for the reservation people to find a room meeting what you ask for.
Recent reports with this "room ready" system have seen people being offered what rooms are available in their category. For example, for my June trip, I had booked a studio. On a whim, I added a pool view request to my ressie just to see what happened. I wasn't going to cry over it if I didn't get it, but thought I'd test the system. When I checked in a room fitting that request was available but not cleaned. I was then given a list of studios that were available that day to choose from AND were clean. I chose something completely different from pool view and it turned out just fine.