People are far too impatient and expectant when it comes to the draft.
Not every player selected is going to have an impact, let alone have an immediate or lasting impact. But not everyone who fails to make a Pro Bowl or get named as an All-Pro or lead the league in something is a bust. Nor does a player not having immediate success as a rookie mean they cannot or will not ever be a productive, successful NFL player.
You see it mostly with 1st rounders, but there's some creep into the 2nd and 3rd round since you can find talent there.
The word "bust" gets thrown around pretty casually, too.
Tough to establish criteria, but a guy who has his body break down, shortening and hindering his career is different from a guy who sucked on the field, didn't put in the work and washed out before the end of his rookie contract.
While I think we can agree that Staley has the Chargers underachieving, to be kind, I'm not sure Rex Ryan is the right guy to criticize coaching. He has a sub-.500 career head coaching record, and is best known for having his own foot fetish put on blast, and the Butt Fumble.