I think Nathaniel Hackett is an offensive coordinator who should probably be an excellent position coach. If he has good offensive skill players they can make him look good, and he might rise to the level of 'ok' as an OC, but I don't think he's much above that.
He's over his head as a head coach.

I also think having the Hackett last name and connections through his dad probably got him a leg up. Nepotism runs rampant in the NFL.

Does he have a reputation for developing players? If he does I don't know about it.