Mack is not a starting caliber PG, and he has sig defficiencies, including way too high usage rate for a non-primary scorer, poor free throw shooter, and inability to guard quicker PGs on the perimiter (Miami, Sac, & Toronto killed Jazz with PG penetration). BUT, with that said, he's a pretty decent backup PG and best PG on Jazz at moment not named George Hill. He definitely helped Jazz stay afloat with injuries to Hill more so that would have Exum or Neto. So give him props. He's definitely an NBA player, perhaps one of better back-up PGs in the league. Only, thank heavens that he's not our primary PG once Hill comes back.