I'm decent on Fifa - but the scripting from EA drives me mad.
They script it so you're invincible for 20 games, you can score stupid goals all the time, the ball bounces back to you hit the post every time etc - it makes it too easy.
Then all of a sudden, they make you absolutely woeful, against someone who is 10 x poorer than you.
It's so so bad.
There is a way of beating the script though.
If you make sure you don't score against your opponent more than once in the first 10 minutes of the first half, you'll not be hindered.