Frank Miller IS one of the greats, and the one to save both Daredevil and Batman from the low sales oblivion.
You may not like him, but let's not be revisionist about an important contributor to the comic book medium.
The Dark Knight Returns is an incredible piece of work. So is Batman: Year One. And his Daredevil run, Ronin, Sin City, and many others.
DRK and Alan Moore's Watchmen are seminal stories. Ones that stretched the medium, and broke preconceptions about superhero comics.
It seems like people now hate The Dark Knight Returns by association. Because of what superficial elements Zack Snyder stripped for Batman V Superman (which is NOT a DKR adaptation), or Frank Miller's political leanings and later works, the string of writers badly copying that comic book's writing and characterization out of context for Batman stories, etc.
Context is important for DKR. It IS a satire about the madness of Ronald Reagan's 'Mmurica. And it is a "what if Bruce Wayne ended up as a bitter and sad old man, missing the old days of glory as Batman?"