They've been grim and gritty before, so it's not unusual for those characters. DC's strengths also apply to the big name heroes who are timeless and span all genres and interpretations. That's always been one of DC's core standards. So while a gritty Superman is "wrong" to you, it's not actually wrong, it's DC doing what they've always done. And Titans itself WAS gritty and dark in the Wolfman run so that's not even remotely wrong