Simple as that, is it? Good or shocking. No middle ground.
I watched a mediocre Sheffield side take City's defence apart on several occasions on Monday night. If their finishing had been anything other than powderpuff, they'd have scored three or four. Yesterday lunchtime, I watched a talented but hopelessly inconsistent Norwich side score three against Villa, one of which was a world-class long-range strike. Sheffield had 14 shots against City, 6 of which were on target. Norwich had 16 shots against Villa, 6 of which were on target.
As I've said before, the margins are very fine. Even I can work that out.