Those who haven't seen it, should watch the baseball doco, "Battered Bastards of Baseball."
It tells the story of the Portland Mavericks. It was a team started by Kurt Russell's dad Bing Russell, and at the time was the only independent team in minor-league baseball.
It was run on a shoestring, and was not expected to be competitive against the Major-League affiliated teams. But they kicked ass, winning divisional titles.
Basically it highlighted the different between an actual TEAM, (comprised largely of delisted veterans) and the farm teams who's primary role was stashing and developing kids.
My point is that as long as the G-League continues as simply a development showcase for the NBA, it's not going to match real teams.