Japanese cartoons have been popular in the West since 1963 - Astro Boy beat Superman in the ratings. Since then, various anime series have gone on to become cultural touchstones in America - nobody saw the Hollywood movie, but everybody knows who Speed Racer is.
The variety of UHF stations in the 70s and 80s filled their morning/afternoon programming with syndicated Japanese cartoons like Eighth Man, Amazing Three, Prince Planet, Gigantor, Marine Boy, Kimba The White Lion, and later Battle Of The Planets, Star Blazers, the five series that made up Force Five, and a host of other shows.
Rap artists name-drop Voltron, there’s a Robotech feature film in the works, and Sailor Moon not only got a generation of girls to watch cartoons, but back to buying comic books as well.
For kids watching cartoons at the time, the stark contrast between, say, Rubik The Amazing Cube or Turbo Teen and something like Robotech is startling. Many of these kids grew up wanting to find out more about Japanese animation, and discovered Japan has been cranking out cartoons for fifty years. A lot of them are junk, but the ways they fail are at least different from the ways American cartoons fail. And after the hundred and fifteenth iteration of “kids and dog solve mysteries” the cliche of the five-member-team-super-robot series is a refreshing change.
It’s worthwhile at this point to mention that America is actually behind the curve when it comes to the appreciation of Japanese animation. Europe went absolutely crazy for super-robot cartoons in the 70s - Ufo Robo Grandizer, a show about a badass from outer space who has his own flying saucer which contains an ultrapowerful superdestructive fighting robot and who battles space aliens, one of whom occasionally splits open his face, longways, to reveal his tiny, hectoring wife who lives inside his skull - was the number-one rated television series in Italy. Asia, South America, even the Middle East has a long history of lovin’ the anime.
Bottom line: the Japanese know how to make exciting, colorful, entertaining animation for children and adults. It’s no surprise people everywhere like it.