I cannot imagine that anyone who has stayed in a regular hotel room will be disappointed in an OKW studio.
You will have a microwave and mini fridge which saves you tons of money. The bathroom is huge. It is a quiet resort, no kids running up and down the halls, etc. If by saying the studios are not the greatest, they may be comparing to the extremely large one and two bedrooms. I cannot tell you how many trips I have made to WDW, 6 just last year, and I have stayed in every hotel but AKL, and I would much prefer an OKW studio to any Disney hotel room on property, with the exception of suites, of course.
Regarding the one bedroom. We prefer to take an aerobed than use the sleeper sofa, only because of convenience. The aerobed inflates and deflates very quickly each day and is very, very comfortable. I know they are replacing the sleeper sofas at DVC, and the new ones supposedly are very comfortable.
You take the busses to all the Parks from OKW. You can take a boat ride to DTD, which is a wonderfully pleasant ride.
There are 3 or 4 pools at OKW. Are you renting points or paying cash for your reservation. If renting, no daily mousekeeping, but I promise you do not miss it. You very quickly learn to love not having someone coming into your room. If you are paying cash, you would have daily cleaning. Same deal with supplies, renting, bring more, paying cash, you would receive from mousekeeping.