Worst ratings ever?

[talisman]

I did something completely wrong?

No, you used a recognised counter to that formation. But, it is further evidence that 4W defences are no longer as effective against a narrow attacking formation as they once were. I tend to use 3N-1-4-2 or 3N-1-5-1 (depending on opponent strengths) against 4-2-1-3 and get better results even against stronger teams.