Dan DiDio hated 52.
There's an interview with Mark Waid up at some website (http://www.aintitcool.com/node/40896). While he dresses it up in tact, he says some pretty damning stuff about current DC management.
Waid on his Legion reboot: But now we're back to what I was saying before--how liquid DC continuity was at the moment. While we were busting our asses to rebuild the franchise (and getting periodic fan notes from Paul Levitz, which were gold to me), a whole different editorial office was allowing Brad Meltzer to undo absolutely all our hard work for one of his JLA stories, which (he'd been told) could star the 1980s Legion, as if ours never existed. I don't blame Brad at all, but boy, was that mismanaged on all levels--because it was deliberately kept secret from us until it was on the verge of being printed. I would have JUMPED at the chance to play along somehow, thus strengthening a new Legion series that were on about issue four or five of, rather than sending a message that our Legion was just some sort of aberrant fan-fiction. (Yes, I'm still pissed.) Barry and I were dealt with in unbelievable bad faith, which I could have endured, but it wasn't just about Barry and me; it made DC as a whole just look stupid and uncoordinated, and I still love DC enough to hate when that happens.
Waid on 52: The biggest challenge was actually, wisely, kept from us by 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. Siglain, having less seniority, was less able to do so, and there's one issue of 52 near the end that was written almost totally by Dan and Keith Giffen because none of the writers could plot it to Dan's satisfaction. Which was and is his prerogative as EIC, but man, there's 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."
Dammit, what's wrong with DiDio? Seriously, it's incredibly obvious that pretty much any random fan would do a better job running the DC Universe than him.