Personally iv just seen norwich's keeper Dave Marshal concede 3 against me and get a 9 cos he pulled off some amazing saves to keep the score down, seems to be pretty inconsistant.
I have more of a problem with ratings for my central midfielders, even if they are world class players they always seem to get 6's or 7's. Although despite this they seem to play well enough in the match engine.
And iv only once seen a 10 in fm08 and that was a player who slammed 4 past me and also got 3 assists (yeah i got boooooomed 7-3) lol