Do player ratings matter?

[Sxrenity]

He's getting bad ratings because he hasn't had to make saves.
The only time keepers will get 8/9 ratings is if the opposition have had a good amount of shots on target and your keeper has had to make crucial saves.

...which is a bad thing, you want a solid defence, so if your keeper doesn't need to make any saves and gets a 5 rating, don't worry.