They don't care what Juergens brings: good energy, quickness, hands, ability to get open. All they see are his mistakes. Why? Because they want the guys that were higher ranked high school recruits starting. Period. Their lack of experience and mistakes are ignored.
This is no different than the anger every time Michael Alisa or David Foote carried the football. CB wanted 17 year old freshman Jamal Williams to get 25-30 carries a game and nobody else to get a touch.