I'm amazed there can be such a thing as a "bad" S&C coach. It's so simple and techniques/exercises can easily be found all over the internet nowadays.
What's not simple is bringing the focus/intensity and being consistent with it for an extended period of time. That really does boil down to the players individually.
This of course is leaving supplementation and diet out of the equation. Not sure what the rules are there, but I'm guessing the "good" S&C coaches are finding a way to "inject" a little more "juice" into their regimens.