Kek it's certainly not a classic if it has garbage art. A manga is about two things, story and art (they both don't have to be the best but should go hand in hand). If it lacks in one part no way I'm forcing myself to read through dogshit just to experience a "classic". No way anyone genuinely enjoys bad art in manga. You'd kill to have ashita no joe drawn by someone good.
Another garbage glorified by absolute manchildren. Anyone who pretends to love it is either fully retarded or just coping with the pain of having to read through 1000 chapters of what looks like used adult diapers.