You're letting your fanboyism get in the way of blatant facts. Criticize DiDio's creative decisions and dickish behavior all you want, I certainly do as well. Still doesn't change the fact that when you look at the numbers, plain and simple, DiDio's tenure as publisher has been a massive success.
DiDio's pet project, the New 52 has been a sales success for DC's comics line. When Levitz left, DC's sales were declining (the entire industry was declining) and they were losing share to Marvel. Under DiDio's tenure, not only has DC's market share gone up on par with Marvel's, DC's sales are up over 20%, and the entire industry is up (by almost a third). DiDio's tenure has also allowed DC to develop a digital policy that is relevant to today's era, bookstore sales are also up, and DiDio has been more aggressively utilizing DC's IPs like Watchmen and Sandman. Numbers don't lie dude, they point to DiDio being a success.
DiDio didn't destroy DC Comics. He pretty much saved DC Comics which was just an executive decision from Warner Bros. away to just simply shut down the division and license the properties out to other publishing companies while DC Entertainment milked the characters for movies, toys, and cartoons. If anything Levitz was going to destroy DC Comics. I love the guy and what he represents. But his desire to stick to the past was ruining the company. Times have changed and businesses need to adapt to changes.
DiDio deserves a lot of criticism. He lacks the respect for creators the way Levitz did. A lot of the New 52 changes are kinda dumb. He's kinda wishy-washy on the creative direction DC should take. But "destroying" DC Comics is an undeserved criticism when he brought much needed business strategy to DC's publishing division.