How about both, a minimum amount of good training. Sure there's always the temptation to just make the minimums, and do it in the easiest way possible. But surely training with good scenarios, focusing on the most important and/or hardest to master items shouldn't cost any more than poor training. You tie up the sims the same amount of time in either case. I'd guess maybe preparing the scenarios and "lesson plans", would take a bit more effort than just cranking out hours of lessons.
It just never occurred to me that TIME in the simulator wouldn't be put to the best possible use, FAA time mandates or not.