The AB is fine when it is working but becomes progressively more difficult as degraded modes are introduced.
I think what you meant to say (before you contradicted yourself) was the AB is fine but gets progressively more like a real aeroplane/Boeing as degraded modes are introduced. This leads to confusion because the 'operators' are then required to do something called 'Flying', a task that they rarely undertake and are, therefore, not very good at it.