I still haven't finished "The Ballad of Gay Tony." I can't get past the section where you have to steal the helicopter and destroy the yacht. My flying sucks too much to be able to take down the yacht.
Yeah, the copters' weapons aren't easy to aim. But at least the yacht is large and stationary. After you destroy the yacht, you have to take out the little boats that are fleeing the scene. Trying to hit them with your guns is such a pain. I really hope GTAV makes it easier to aim helicopter weapons.