Checked out some dates in October and November at Disney's All Stars on Expedia and price comes out at £45 a night less 10% Quidco, plus nectar points and free cancellation. Disney's UK web site is currently showing £50 a night less 3% Quidco.
Add the benefits of staying on site such as free transportation from/to MCO or if you have a hire car then free parking at the parks, then those prices seems very competitive to a number of the off-site budget-hotels.