DKSA and ASBAR aren't in canon with DKR, for me.
Like it or not, they are in fact canon to DKR. To deny that, is to deny the reality.
And Bob Schreck is the guy who gave us those two books, and told Miller that he was doing great, instead of telling him that "this was Batman and not Sin City, please stop writing it as such." In short, Bob Schreck encouraged Miller to get worse instead of giving the writer that revelation he really needs.
Frank Miller's comics had the Sin City noir feeling and themes as far back as his original Daredevil run with Daredevil and a gun, Karen Page doing porn in Miller's Daredevil: Born Again, etc., and Batman: The Dark Knight Returns features Batman as a vigilante outlaw wanted by the police, drinking alcohol, using guns, being very brutal and breaking his opponents bones, similar to Frank Miller's Sin City characters, Batman: Year One features prostitution and corrupt cops in a corrupt city, like Sin City, long before he made Sin City.
'80s Miller was great, '90s MIller was all about Sin City which wasn't bad at all, though only some other works weren't so good, but Miller now: a joke.
You are acting like you're opinions are facts. Everyone did not even agree that Miller's '80s writing was great in the '80s. Frank Miller's had his opposers since his early Daredevil material in the pre-internet era. Frank Miller has always been very controversial, from his original Daredevil run to today. He's very polarizing. There were people who disliked his Daredevil material and felt it was too grim, too violent, too brutal, too noir. Comics Journal #58 (1980) reported that Marvel's Jim Shooter refused to publish Frank Miller and Roger McKenzie's two-part drug storyline titled "Child's Play" and "Good Guys Wear Red!" in Daredevil, intended by Frank Miller, Roger McKenzie and editor Denny O'Neil for Daredevil #167 and 168 (1980), after it was not approved by the Comics Code Authority.
Marvel finally published the two-part story in Daredevil #183 and 184 (1982). In Comics Journal #77 (1982) it was reviewed by Ted White, who called it "a real letdown."
Frank Miller said in Comics Journal #70 (1981), "There has been an increasing number of letters complaining about the violence in Daredevil. At the same time, the sales have been going up astronomically."
In Comics Journal #71 (1982) Dwight Decker complained about how grim Frank Miller's Daredevil was:
Also in Comics Journal #71 (1982) Gary Groth complained about how brutal Frank Miller's Daredevil was:
There were also people who disliked Batman: The Dark Knight Returns. C. Carr, writing for the Village Voice in 1986, characterized Miller's Batman as "Rambo in a cape." Described Miller's portrayal of the Mutants gang as "disguised racism" and summed up Miller's Dark Knight as "cynicism" and "neoconservative propaganda."
As reported in Comics Journal #111 (September, 1986), on June 27, 1986, former Batman writer Alan Brennert called into Harlan Ellison's Hour 25 radio talk show which was broadcast on Los Angeles KPFK (90.7 FM) and called Miller's Batman a "psychopath." He cited Batman putting out Joker's eye "and Joker runs around for three and a half pages with one eye out. This ain't the Batman I grew up with. I don't think Dark Knight is up to his (Miller's) standards." Harlan Ellison called Miller's Batman "Batman cast as Dirty Harry." Harlan Ellison criticized Batman's treatment of Carrie Kelley, claiming "Batman keeps reprimanding her as if she were a ******."
In Amazing Heroes #120 (1987) Darren Madigan claimed Miller made Batman "an unadmirable, unsympathetic, borderline psychotic. Miller had already done this once to Daredevil."
As Frank Miller said in the documentary Comic Book Superheroes Unmasked, "In the mainstream media it (The Dark Knight Returns) got a great deal of attention, positive and negative, within the comics industry it was the closest thing to a bar fight that I had ever encountered, in that it was quite controversial. I actually got called up by former Batman writers telling me I had 'ruined their character.'"
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Frank Miller: "There was some mixed reaction with The Dark Knight Returns as well. But years later people started liking it so, I don't know, I did the best and most sincere piece of work I could and I'm proud of it."
http://www.amazon.com/gp/feature.html?ie=UTF8&docId=562386
Frank Miller: "If the internet had been around for Dark Knight (Returns), they would have been complaining as much as they are now, because the internet is there for people to complain. Batman says ‘Goddamn’ and they get the vapors. Screw ‘em."
http://doubleshot.forumcommunity.net/?t=1770758#entry31903871