The Dark Knight Returns is one of the most overrated stories and the art style is horrible. Not only is Carrie Kelley one of the worst things ever, Frank Miller decided to ruin Superman too. John DiMaggio made a great Joker. Probably the best after Mark Hamill and his talented impersonator, Troy Baker. Also thought Bruce Greenwood was great as Batman. But yeah, can't wait for the Killing Joke. Glad they got their definitive voice actors back for it.
The Dark Knight Returns would be a difficult work to call overrated seeing as besides, perhaps, the killing joke, it is the most definitive Batman title ever written and a work influential not only to graphic novels and comics as a whole, but also recognized outside of the nerd universe for it's general literary excellence. Love it or hate it, it's a standard to which all other comics and batmans must inevitably compare themselves. It's your grand-daddy that fought in WW2 that your daddy won't stop rattling on about when he wants you to have respect for other people's property.
As for Carrie Kelley, she's certainly a polarizing choice, but one I ultimately never had an issue with because I see her as more of a story device and symbol than as an actual character to be held against other robins.
As for ruining Superman, I really don't see this as ruining Superman so much as taking that which has always separated Superman and Batman and setting it in a dystopian nuclear war scenario and aging them both quite a great deal leaving them decades for that rift to grow. I actually find the dynamic between the two expressed her to be very well thought out and the execution of that thought experiment is flawless.
John Dimaggio's joke was unforgivable. It was like...hood rat joker. I kept imagining Samuel Jackson doing an impression of Omar Little doing an impression of the joker when he talked.
But we can agree Troy Baker's impersonation is golden.
I found Greenwood's Batman acceptable, although sometimes I didn't feel like he could hit the forceful tone enough. Although, he was also better for the emotional scenes so...
Aww yeah, I'm really glad they got permission for an R rating too.