Story 8/10 - As many have already pointed out, the sheer amount of fillers and flashbacks, boy! They're unbearable. But thanks to fan-made Naruto Kai, pacing should no longer be an issue now.
Still, can't afford tens of hours? Watch the entire show at 1.7x speed then! If you're a native Japanese speaker like me, you should have no problem keeping up.
Some of the arcs like Pain's arc had a deep & profound philosophical theme and I loved it. Had it not for the pacing, I would've given 10/10, but alas.
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Art 6/10 - I had to drop the show for 2 years because of the art-style. The change from Naruto to Naruto Shippuden certainly requires a bit of getting used to.
Picking it back up after two years, everything looked so much better for some reason. But still, it's by no means perfect or even good.
The animation on the other hand was outstanding, especially battle scenes.
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Sound 10/10 - To be honest I didn't care about the OPs & EDs. But that's just because I'm not into Jpop (atm). They're by no means bad, though.
The voice actings were superb. The casts were amazing. LOVED the background music! - 10/10
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Character 10/10 - Masashi Kishimoto is a genius at making characters loveable. Gotta love the easy to remember simple character names & their unique quirks. Most characters had a pure heart, and that's what drew me in. - 10/10
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Enjoyment 10/10 - As I said, watch the Kai version at 1.7x speed and you'll enjoy every minute of it!
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Overall 10/10 - I always preferred One Piece over Naruto, I even fought my college friends over it, but after finishing the series today, well what can I say, I've finally experienced the change of heart. Lol.
Naruto is now one of my all-time favorites - Take my 10/10!!