Personally, I think Naruto is the second stage of Pokemon phenomenon. Most Pokemon fan is between 9-11 years old. They thought it's the coolest anime in the world.
As they grown up, they found another series --- Naruto. This happen to those who are between 13-16 years old. They're now found out about shounen stuff and thought Naruto is the best series to come out from this genre. Now, most of them thought Pokemon is a little childish anime to watch. Without knowing the reason why they thought Pokemon is childish is because now they're all grown up.
There are two result comes from Naruto,
1. Anime/manga fan will look up for new series and found out about other series that's better than Naruto. Which is why they consider Naruto is kiddish, lame, repetitive or such.
2. Self proclaimed anime.manga fan will be blinded by Naruto. That's where they got the term Narutards. They don't watch a lot of anime to begin with. Most of them start off with Naruto, which is why they consider Naruto is the best shounen anime out there.
There's an exception to die hard anime/manga fan. They've watched/read a lot of series other than Naruto. They found out about new series that is better than Naruto. But they still watch/read Naruto. However, they don't claimed Naruto as the best anime (or shounen type) of all time.
My opinion only involved those that born after 90's since most of C&A people are born after 90's. Most of them start off with Pokemon and Naruto in their life.
Anyway, I still like Naruto, but I don't really love it. Not to the point of dying to see the next chapter to come out. I think there's a lot of other series is much better than Naruto. But still, I don't dropped Naruto just like that. I still continue reading it. No matter how bad the series is, once I decided to collect it, I'll make sure the collection will be completed.
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This one wasn't related, just wanted to share my experience
You see, my country just released Naruto Vol 37 and One Piece vol 50 at the same time couple days ago. I don't read Naruto chapter online, I'm far behind most people in C&A because of that. However, when I read chapter 330-339 in the manga volume. I found the chapter is a bit.... boring? I don't feel anything while reading it (even though this is the part where Asuma died and Shikamaru takes revenge of him). Not sure why I felt that way.
Different things happen to One Piece, because even though I already read One Piece chapter (and finished Thriller Bark arc) online, I don't get boring when I read it again and again in the manga volume. There's something about One Piece series that never failed to impress me (especially when I read SBS because Oda revealed some of his hidden character on it).
Maybe I'm a little biased because I start off with One Piece before Naruto (the main reason is because my country released One Piece before Naruto).
I'm not born after the 90's either. Because of that, the first shounen stuff I know is Dragon Ball and Dragon Quest Dai No Daiboken.