But that is only a loose approximation. For example my current character is a level 11 Thief
Atk vs AC: is 20 not 16
Atk vs NAD: is 20 not 14
AC: is 26 tick
NAD: 20,26,18 that is -4,+2 -6
The attack numbers are way over and that is not counting combat advantage. The NADs are a fair bit worse...