the mytyres ratings are just from other places though. the best rating is the one that gives you marks out of 5 for all the different aspects of the tyre, but when i looked up how those are calculated its just from a database of people in germany saying what they thought of the tyres.
so you have to put your trust in a load of germans who probably arent all driving performance cars and wont have tested all the other tyres either. its alright as a rough guide, but i wouldnt take too much notice of it