I think it's a good system. However, it can easily be poor management. If you're not promoting your prospects properly, they'll destroy the turds in HiA. For the most part, however, you can win 70+ by simply having full rosters and decent defense. Also, I look at minor league success as a way to develop players. You can get in the neighborhood of an extra 20 games, with plenty of rest to play starters, by running thru the playoffs. 20 games is an additional 7 starts for a SP or 75+ AB for position players. Three seasons of that is half a minor league season.