Forgive me, but I have the urge to take you back in time to an era where "anime" and "manga" did not exist in the average English-speaking sci-fi geek's language.
I started watching anime in the US in the early Seventies when it was called "Japanimation." I watched shows like "Speed Racer" (Mach GoGoGo), as well as "Kimba: The White Lion," and "Gigantor." American TV didn't really open up to anime until 1985 when we got the amazing mash-up of three separate anime series to form "Robotech." I was addicted to "Robotech," and I remember coming home from college classes to catch the 3pm episode because it was like a sci-fi soap opera. That's when I started to see more and more anime titles in video rental stores. Of course, none of these stores had an "Anime" section back then. Mostly, these titles were shoved in the "Foreign Films" sections. The nearly defunct Suncoast Movie Company stores was the first time I saw a corporate video store have a dedicated "Anime" section, and that was some time in the Nineties.
Back when I was a kid, the only way to purchase manga was to fly to Japan, buy a bunch of titles at a shop and bring them home. Of course, you had to know kanji because no one was making English translations of manga when I was a kid. Then, vendors at a local sci-fi convention would offer a much wider range of titles, if one came to your town. Manga popularity did not really begin in the States until the 1990s, and it was slow to catch on. Back then, only the most hardcore fans had manga. I remember going to Borders (RIP) bookstore around 1995 and having to dig through the sci-fi section to find a tiny shelf with (maybe) 10 manga books. Now, Barnes & Noble stores have entire fixtures devoted to hundreds of titles. Manga fans today are very fortunate, indeed.
Anyway, in 1989, I saw Katsuhiro Otomo's "AKIRA" in a Beverly Hills movie theater. The showing was packed with fans of anime, (a small, exclusive group back then,) and it was a time where we had discussions about "new" topics like "adult anime." Terms like "hentai" or "tentacle porn" were completely unknown to us back then. But we were fascinated by this faraway culture making animation that American companies simply weren't making. When I finally saw "AKIRA," the animation blew my mind, and to this day, it is my favorite anime film by a long shot. That film created a cultural shift in American tastes in animation. After that, the flood-gates were opened, and more American companies were importing and translating anime and manga titles into English. Today, there are more titles than anyone can possibly consume in a lifetime. It is really a great time to be a fan of Japanese entertainment.
Without "AKIRA," Disney would never have financed the distribution of "Princess Mononoke" or "Spirited Away." "AKIRA" helped create a wave of interest in manga publishing and anime imports that culminated into what we see today.
I must say that, regarding anime, I am very picky. I'm into the animated realism of Otomo or Hayeo Miyazaki. I loved the animation in "Grave of the Fireflies," "Ghost in the Shell," "AKIRA," the shorter "Riding Bean," etc. But I admit, I am behind on my anime watching. I like harder-edged stories, which is why I liked what I saw of "Attack on Titan." I still need to finish the show, though. To me, if the animation is top-notch, I'll give it a try. I'd love to get some recommendations for some intense, edgy anime.
TL;DR - I'm an old-school anime watcher from the distant past, so what kind of hardcore, intense and edgy anime would you recommend to me?