I actually lost a game against a 88-rated team with the silver squad for swaps. 6-1. But that is fine, it makes sense. It's those cheating crappy teams that **bleep** people off.
You can always beat the best teams on WC by just using through balls to a meta attacker. Cutback passes from wide don't work for me and get intercepted 95% of the time. Anything in the air is nigh impossible as AI is insane defending headers.
Whatever difficulty, the AI is stupid enough to dribble with their CB to the box if you dont pressure. Then steal the ball, counter and exploit the gap.