For a "series" that was announced in 2007, a book-per-year pace doesn't give me the impression that this is something anyone involved is taking seriously. I don't mind late books, but a non-existent schedule and "whenever it gets done" attitude? That's kind of disrespectful to readers.
While I understand that, too, if you think of it more as a set similarly-themed specials instead of a series, the objection diminishes somewhat. Plus, after waiting fifty to sixty years for some of these books, what's another few months...?
I think other people nailed my objection. It's billed as "what would the very next issues of this old series be like," and some of the stories kinda-sorta feel like it. But there's far too much time spent looking down on the Golden Age work. The stories are often (but not always) too tongue-in-cheek or decompressed, and the art is more "dumbed down" than Golden Age, which irritates. This is the sort of project where Larson needs to get out his big stompy foot and say "this is my vision for the book; if you're not on board, the sources are public domain and you can go do what you want elsewhere with my blessing."
Project Superpowers...? I gave up on it after a few issues for a variety of reasons. It felt like more "guided tour" than story, like the old Marvel and DC "scavenger hunt" storylines for crossovers. The characters didn't seem to have any chronicled history, instead getting a common backstory. Everything that's wrong with the world is due to superheroes, in some way or another. Real world revisionist history abounds, to make superheroes and the United States look bad. Attempts at humor fell flat for me. I mean, I could go on for a while, here, but lots of things just rubbed me the wrong way, in the final analysis, and it wasn't helped by Alex Ross wandering around talking about how he wanted the characters "as archetypes," rather than actually reading stories and trying to figure out what everybody's about.
A lot of my complaints may have been fixed, and I'm not saying that anybody who liked it needs to defend it to me, because heaven knows there are probably TONS of things I enjoy that are even more objectively horrid, so I'm in no position to judge quality. But for my sensibilities, it was a bad way to start a story that didn't look like it would go anywhere.
On the other hand, I'm totally agreed on the Charlton thing...but I'd also include Fawcett and Quality in that mix. In my eyes, DC has consistently dropped the ball with acquired characters, because they always reinvent and segregate them.
I mean, really. In the Post-Crisis DCU, the universe is without a Golden Age Superman. And here you have Captain Marvel, who's got a strong Golden Age sensibility and similar conceptual clout, and can have successors to the modern day. And therefore? Let's create him anew with no history, in the modern age, and then exile him to "Fawcett City," because nobody really knows what to do with him.
The Freedom Fighters had a decent run under Rozakis, but even Roy Thomas stumbled around until finally just dumping the characters on Earth-X to be picked up later, rather than integrating their Earth-2 counterparts into his stories. And since then, they're barely seen except as cannon fodder when there's a big villain on the loose. (Meanwhile, Black Canary becomes increasingly important to continuity, while the more interesting and more recognizable Phantom Lady sits in Limbo, waiting to be killed again.)
So it's not really a surprise that DC couldn't bring the Charltonites in as-is and integrate them into the world's history, even though they could certainly use Cold War heroes like Captain Atom, as the JSA slides further into the past. (And they certainly wouldn't dream of giving a major DC player the Blue Beetle identity--a friend once suggested Dick Grayson, since the Nightwing mantle is sort of a dead end, less than Batman, but still tethered in. Giving him top-billing in a different legacy would finally let him grow up. Plus, the personalities match up fairly well.)
(This is also why I never had high hopes for the Archie deal. From the very fist interview, DC said they'd be new characters with the same names, as if they were created from scratch today. But, to be fair, I haven't given it a look. Same with the Twelve; seemed like an OK idea, but I just couldn't muster up the motivation to try it out.)
I wonder if it's a copyright thing, in the end. DC could be reluctant to overplay these historically-important characters, because it draws attention to the fact that anybody could also use them. So they create brand new versions, hoping they catch on and replace the memories of the versions they don't own.