This manga seems to be really polarizing, you either really enjoy it or you think it's beyond stupid. I personally am one who enjoys it, but I'll admit, there are some chapters that make you think "why am I reading this again?"
Many people that complain that it should have ended awhile ago but for the scope and the amount of just everything that this manga has in it, making it end sooner would have just left too many untied ends. Currently, you can feel the story coming to a close but in a way that also answers the questions we've all been wondering.
Overall, I give Naruto a 9 for a few reasons.
One: action scenes. Too many brilliant manga have been ruined by poorly executed fight scenes that have so many things going on that no one can figure out what just happened, Naruto typically maintains a good balance between uncluttered drawing and dialogue.
Two: Characters. We've all read manga in which every other figure looks exactly like someone who appeared two pages ago, minus maybe a different hair color. In this manga, differentiating between two characters is easy: every person has a distinct look and all the main characters can be recognized with no second guessing. One other thing that I think is rather rare is the fact that parents/siblings/family members actually look related to each other.
Three: it's in depth. I'm not sure if this is just me but I find it cool when I can see a picture of a character and instantly know a huge chunk of info regarding who the person is, who their family is, what they can do, and how they tie into the story. The further and further you read into the story the more you realize just how massive Kishimoto's ninja world is.