Are the ratings of any use ??

[Soham_NagpurBluesFC]

Yesterday i played my cup match.... and to my disbilief i lost 6-1 :/ ( Unlocked the Bad Day Achievement ,though ) :P
But when i checked ratings.. my players had all 7-8 ratings but his team had 2 5 ratings... ??
So how is it possible that i lost 6-1 !! , or the ratings are just a timepass part in the game ??
And top of all , my GK had 7 rating while his had 5 rating , still i managed to score only 1 and he 6