Agreed, but I actually just found a work around that might work (not sure havnt tried it yet) Supposedly you can rate one car then exit out and go drive around for a few minutes and then go rate another one.. Rinse. Repeat.. Sounds like it could take awhile though. And sometimes it still freezes. But if you exit out and drive it saves the ammount of cars youve rated.
The trick is to go rate a car and then exit out of rate my ride, go to garage, and change cars. Then wait a few minutes and go back and do it again. Once you change cars and exit the garage it saves your proress. It still freezes a lot but if you can get in 25 times and back out to the garage the trophy is as good as yours. If you just keep rating cars until you freeze without going to the garage and changing cars it doesnt count the cars you rated before it froze. Not exactly a solution for the freezing but it does work i just got the trophy.