I wouldn't describe DC's New 52 as a success. That they abandoned it at least partially by summer of 2015 with the "DC You" branding (and then entirely with "DC Rebirth" a year after that), less than four years in, would suggest they agreed.
There were a lot of factors. DC throwing out their history and legacies, but even more half-assedly than they did after Crisis on the Infinite Earths. So Batman could still have four Robins (in 5 years, apparently), but there could only be one Batgirl (Barbara, naturally). Four Earth Green Lanterns (and Geoff Johns just kept doing the same stories he already had going), but only one Flash (Barry, naturally).
The Jim Lee redesigned costumes, were to put it politely, too busy. To put it bluntly, they sucked. The claim that things were going to be new, but the majority of the books were helmed by guys who had been writing comics for decades didn't help. I've enjoyed Tom DeFalco's work, but he's not a writer I'd turn to for something new. Then editorial kept driving creative talent off books with heavy-handed oversight. Not much point to putting George Perez on Superman, only to piss him off in less than 6 issues.
Saying all that, it did give me 16 issues of China Mieville's Dial H series, so it wasn't a complete loss. DC canceled some titles 8 months in, and Dial H was one of the replacements. It's one of the few real examples of DC trying to get outside the box, in the sense they brought in a published, award-winning novelist with, to my knowledge, no prior comic writing experience. If you're looking for something "new" and attention-getting to be done with your characters, that's a better bet than handing them to Scott Lobdell.
Mieville dives into the concept of the dials, how they were made, how they work, how they end up where they end up. Gives them an air of body and especially psychological horror. The toll it takes on the person who uses it, to have another entire personality and memory super-imposed over their own, especially one that seems so much greater than them. One of the two main characters (Nelson) struggles to keep track of who he is and what he planned to use the powers to do when he dials, while the other (Roxie) hides whatever identity she dials behind her own mask, costume, and codename, as a way to keep her mind clear.
There was also an entire issue based around the idea some of the dialed heroes are just too culturally offensive to go out as in public unless there's no other option, which was pretty hilarious, and a fair point, given comics' questionable history when it comes to depicting races, cultural trends, sexual preferences, so on.
As far as the designs for the dialed characters, I don't know where the breakdown is between Mieville and his artists (Mateus Santolouco for issues 0-5, David Lapham for issues 6 and 7, Alberto Ponticelli for 8-15), but the designs are great. From the creepy Boy Chimney, to the ridiculous Cock-a-Hoop, to the Glimpse (who is drawn so you only ever see a small bit of him in the panels). There's an essentially sentient mass of plankton that beats the crap out of a whale. Like I said, I don't know who gets credit, but all parties involved did a great job coming up with some interesting designs and powers to go with them.
Lapham's work is probably the closest to a realistic looking, and the two issues he draws involve the least action by dialed heroes, focused more on a Canadian secret agent with powers. Who is basically a guy in a suit, so it works. Santolouco's art is heavier on shadows, characters look more shell-shocked or freaked out by what's going on. By the time Ponticelli takes over as artist, most of the characters are ones used to this dial stuff, and they just looked kind of tired. His art has a grimy texture, and everybody looks older. His linework's also busier than the other two, a lot more extra shading and scratch mark lines, to the point of overdoing it at times.
Some of that might have been deadlines, because things clearly get rushed at the end. Mieville had a big, universe-hopping arc going, with Nelson and Roxie teaming up with a crew called The Dial Bunch to chase a dangerous "Operator". Unfortunately, DC canceled the book at issue 15, and you can tell Mieville and Ponticelli were scrambling hard to cram enough in to make some sort of a coherent ending. Which they managed, at times quite well. Mieville ends up just alluding to several worlds they've visited along the way, making it seem as though they may have been at this for years. But if they had even another five issues, it could have been so much better.
There was a post-script of sorts, when DC did a "Villains Month", called Dial E (but it was an issue of Justice League, #23.3). It was one of those jam comics, where each page is by a different artist, and it's as much a mess as those usually are. But it did provide a little bit about the fate of at least a couple of the characters.