Mediocre work is a reflection of the managers inability to properly motivate and create a positive workforce within the team. I think the hard reality is the mediocre problem isn't from them it's really from you, as a manager and supposedly leader.
There are diamond dozen like you here at Wells Fargo you probably value the friendships and the greasing of elbows but have no problem being a hypocrite verbally telling your employees one thing putting in writing another and blaming your employees for failed projects that you as a leader should have helped steer.
Mediocre performance, workers quitting, lack of productivity, etc. are clear signs that you as a boss are creating a hostile work environment for your employees and they are just there for the paycheck to try to survive... Instead of blaming your employees about mediocre performance maybe you should look in the mirror and be open-minded to the fact that you as a manager need to change... Maybe you need to ask yourself what you're doing wrong what you were doing to make your employees give just enough to stay employed.
Before you go to the internet and complain about your employees maybe you should accept responsibility for you where you have failed at what you are doing to fail... As a manager at Wells Fargo you should hold yourself to a higher standard, you should be eager to motivate and educate and lead a successful team versus the opposite.