There are plenty of problems with the game as it is, ref's, too many stoppages and what have you, but to me it all started going downhill when the NCAA limited the amount of time a coach could spend practicing his team in the off-season. What used to be a time to work on fundamentals and letting players getting to know each other (in other words learning how to be a team) is now gone. In it's place when practice starts is positional coaching and plays. You watch these games and coaches spend the entire game yelling out to players, where to stand, when to rotate, how to move, when to move. It's become all very mechanical and tough to watch. The teams of the 70's and 80's and into the early 90's just played basketball.
AAU and the absolute lack of teaching basic fundamentals by the time the kids hit college has not helped either.