Really? Well, I don't see it that way. Possibly because I've read the manga of Rurouni Kenshin which is deeper than the anime. But I don't care about the third cousin of the main character's sister's boyfriend, whether he had a tragic childhood (which is what all the backstories I saw seemed to be) in a show. I care about the main focus and the philosophy of a show. That's why I love Fullmetal Alchemist; it's about life and death and sacrifice, themes I love. Naruto... well, maybe if I'd watched it from the beginning, or if it appealed to me at all, I would see something worthwhile there.
But "de gustibus non disput", as they say.
I've never read the Kenshin manga, but I've seen anything other than paper-thin philosophy from the show.
What you're missing is that Naruto's main philosophy is echoed in the character's back stories. For example, one of the shows main themes is loneliness. This is a reoccurring theme in Naruto's, Sasuke's, and Garaa's back stories, with each character's story being a different take on it. So is defining your own fate- this one is worked into half of the back stories, and protecting people who are important to you. The themes are worked into every character's back story before eventually coming out in the main storyline of the series. Each of the series main characters represents some variation of one of the show's themes. The only other anime on your list that I could possibly say that for is Cowboy Bebop.
PS: Viz has already managed to screw up the manga.