Just because a show is popular doesn’t make it the best show. That might seem like a ridiculous answer, but shows like One Piece, Dragon Ball Z, and Naruto are very loaded in dealing with. To start with, all of those shows are shows that have a TON of filler episodes. As such, a lot of people are turned off by the amount of fluff in some of them. In addition, there is also the fact that they have become “word of mouth” anime among the American populace. There are many school kids who would say they are “anime fans” but only watch Naruto or Dragon Ball Z. (Note: I am in no way trying to gatekeep anime from a wider audience, but we think you should certainly try out unfamiliar anime that haven’t been translated or that aren’t American staples.) As such, dealing with any one of these could have been an article itself, but none of them strike as necessarily the “Best Anime of All-Time”