Before last season, Mark Sanchez WASN'T considered a bust. What a difference a season makes.
Statistically, he lead the league in completion pct.
He leads in the league in QB rating.
He doesn't have a huge arm, but he doesn't throw interceptions.
He can navigate the pocket to avoid the sack, and is surprisingly mobile.
Lastly, he has 8 years in the league and knows the game.
Nobody really considers Mark Sanchez a bust. He just isn't a starting QB in the NFL at this point.
Alex Smith was essentially benched this season because he was a guy the coaching staff thought couldn't win them games.
It's 2013. If you don't have a QB who can win you games, if you don't have a QB who can lead the team, you probably don't win.
If Alex Smith were any good, he'd be the one playing in the super bowl and not Kapernick. As already stated, he was completing 70 percent of his passes and they stil stuck with a guy most people outside of San Fran knew about. It was a gamble, but it also tells you what coaches thought and knew. Alex Smith wasn't a guy who could win them games. He wasn't a guy who could win a super bowl. He's a guy who needs everybody else to be perfect, otherwise he just won't win you a game.
The 49ers lose to Atlanta with Alex Smith. They don't come close to winning yesterday. Alex Smith, if he finally lived up to his potential, is kind of a poor mans Chad Pennington. You hope you never have to come back in a game.