Comics had gone through what I called the Dark Age from about 1985 - 2005. After 2005 things started to brighten up and become more hopeful, which I thought was a great thing. This was the post Infinite Crisis, pre-Flashpoint era that seemed to point towards new and inspiring stories. Well the New 52 was new but not all that inspiring. A great example of this is Superman. After IC his origin was re-imagined by Geoff Johns in Superman: Secret Origin. This iteration of Superman was everything the character should be: inspiring, humble, and most importantly he was just a good person. This Superman was fun and flawed and thought of himself as a human (and subsequently Clark Kent) first. The New 52's take on the character was angry, at times very bitter, and thought of himself as an alien/Kryptonian first. This was not the guy that made you want to be a better person simply because of his great example. This guy was kind of a dick. And as the standard barer of all things DC, Superman was a great example of what was wrong in the New 52.
Surprisingly Newsarama did not include Green Arrow in their list of the worst titles of the New 52 but they certainly should have. Pre-Flashpoint, Green Arrow was a crusader for the oppressed who was flawed but driven by the best of intentions, quick-witted, earnest, and someone who took no crap. After the reboot he was nothing more than a pompous rich d-bag with a bunch of toys and no driving moral compass. Everything that was great about this character, going all the way back to the days of Denny O'Neil and Neal Adams, was gone. They tried to incorporate some elements from the excellent TV show Arrow but even that wasn't enough to save this sinking ship. Now to be fair, I gave up on this title relatively early. I'd read the first three story-lines mostly out of sheer hope that things would get better (heck I even hoped that the character would improve in the Justice League of America title but I was wrong). So if things have gotten better I've missed it.