if you don't like what it's doing, do it yourself! Sadly, I think that skill is slowly falling off.
While I agree to an extent with this statement, I also equally disagree. An airplane seldom (not never) does "what it's doing", thats a result of lost of SA or more likely lack of aircraft knowledge. The common recent examples were the famous "after DESDI, left turn heading 290, and when heading was engaged, the aircraft would begin turning right. Would that be the best time to disconnect the AP and turn the aircraft yourself? The 'pre-set' heading was not an SOP for a reason due to the aircraft's design to turn the shortest way.