I’m glad you cannot rate anything if you download the models and set the slicer settings yourself. That makes a lot of sense as the ratings are applied to the profile and not the model.
Many models require fine-tuning slicer settings, mainly to work around slicer bugs. Some users complain when the prints that they do not use the designer’s settings fail or are sub-standard.
I have the same problem with users with little or no 3D printing experience thinking that using a model with a print profile means that everything will come out ideally, regardless of materials, calibration, speed and levelling.
Ratings seem to be working for me, and I have received quite a few in the last few days.