Revisting an old problem: THAC0 WTF?

[Tsotha-lanti]

Because lower being better is unintuitive, especially when it goes into the negatives?

Well, it's also because instead of comparing a sum of two numbers to a target number (all of which are positive), you compare one number to the difference of two numbers (both of which may be negative or positive).

People deal way better with the first kind of task.