Despite how old the article is, here's a good overview:
http://www.therobotsvoice.com/2013/09/8writer_andy_diggle_quits_action.php
Dido pushes and represents a very heavy handed approach to editing. Just from his history, he believes stories are created from the top-down approach -- he wants editorial to dictate the direction of stories. It's the entire creative culture at DC.
For someone who involves himself in creative as much as he does, he has no real vision. In his interviews, you get a sense of somebody chasing trends who second-guesses himself and his people.
Oh, just wanted to add this quote from Mark Waid:
The biggest challenge [of 52] was actually, wisely, kept from us by [editor] Steve [Wacker]. EIC Dan Didio, who first championed the concept, hated what we were doing. H-A-T-E-D 52. Would storm up and down the halls telling everyone how much he hated it. And Steve, God bless him, kept us out of the loop on that particular drama. [Editor Michael] Siglain, having less seniority, was less able to do so, and theres one issue of 52 near the end that was written almost totally by Dan [Dido] and Keith Giffen because none of the writers could plot it to Dans satisfaction. Which was and is his prerogative as EIC, but man, theres little more demoralizing than taking the ball down to the one-yard line and then being benched by the guy who kept referring to COUNTDOWN as 52 done right.'