To be honest I never valued ratings that much. I remember when I used to follow the players I had sold in the old system, some would perform worse and some surprisingly better in their new teams (of course that depends on the team itself). Sometimes you buy really high rated players and for some reason the game just decides that they will suck with you. Best example was last season when I bought a 20yo 99% MC. I was hoping he would be in my team for 2 or 3 seasons, but he sucked so bad it was unbelievable. I sold him before the season was over.