That would be helpful to those just learning the feature. I still can't think of any other choice you could expect the camera to make though. If you are shooting in A mode then the only logical choice to get the correct exposure is to lower shutter speed IMO. It is not a fixed shutter speed but rather it is the min shutter speed before AutoISO kicks in. Something has to give if your max ISO, min shutter speed, and fixed aperture settings don't allow for correct exposure.
I think the D90 AutoISO operates the same way so I'm not sure why a reviewer would not already understand the feature. Admittedly I'm not familiar with other DSLR AutoISO features so there may be a better way. I do have the Canon G12 and the AutoISO implementation isn't nearly as versatile as my D90.