What were the primary criticisms leveled against Frank Miller's run on Batman during the 'Dark Knight Returns' era?

The 'Dark Knight Returns' run faced significant criticism for its depiction of aging Batman, its bleak and dystopian portrayal of Gotham City, and its perceived glorification of violence and authoritarianism. Critics argued it presented an overly cynical and pessimistic view of heroism, and that Miller's style, with its heavy use of shadows and stark visuals, contributed to a sense of hopelessness.