Why are the NBA commentators and yst so freaking horrible nowadays? Who is the worst and the best?

Below is a list of some the commentators calling NBA games and post game yst? Most of them I think stink, some are great; I won't specify who falls into what category...but would like to hear others view. Reggie Miller, Doug Collins, Marv Albert, Mark Jackson, Jeff Van Gundy, Avery Johnson, Kenny Smith, Hubie Brown, Charles Barkley, Ernie Johnson, Mike Fratello, Jalen Rose, Stephen A. Smith.