Warren Throckmorton at Patheos published a long letter from Luke Abrams, a former worship leader at Mars Hill, about the church's current troubles. You should go read the whole thing, but here's the main problem, according to Abrams:
...it’s really sad and challenging for me recognize and admit that there were and are serious problems at Mars Hill, because I not only went along with it complicitly, I actively participated. And while over the years I’ve had the chance to confess, repent of, and seek forgiveness for specific sins of my own, I’ve not done so for the hurt I caused while partnering with Mars Hill. I now see some of these sins, and welcome each of you to reach out to me to help me see more. The things that are clearest to me now is: (1) I routinely sacrificed friendships on the altar of growth, (2) I lived out and defended the early MH years teaching about marriage, which was domineering and forceful leadership, (3) I participated and led in a culture that took advantage of volunteers, using their time, energy, and talent without providing commensurate shepherding and care and (4) I sat by silently as people were treated in ways that robbed them of dignity.
So what's the solution?
I think one of the distortions that Mark and the Exec Elders have bought into is that as long as there is a large and growing audience and healthy giving and service they have implicit support for where and how they’re leading. And there is frankly some truth to that, because as long as people are voting yes with their nickels and noses they are supported.
And Mars Hill has a sophisticated set of metrics they track, not just nickels and noses. The senior leadership team tracks all of the above things and more. I personally believe that Mark and the exec elders will only respond and repent when their scorecard turns red.