Naruto (not Naruto Shippuden) is awesome. It had a nice setting, character development, plot, and fighting scenes. The thing I enjoyed most about Naruto was its character development. The diverse array of characters in Naruto all (with the exception of Ten-ten and a few other people) had their spotlight and unique identities. I especially liked Naruto because he was the hard-working underdog.
You also get these bad-ass fighting scenes. These fighting scenes, I felt, actually made sense. There weren't many nakama-power ups, and the good people didn't always win. Everyone was limited by chakra. You also get some cool strategies!
I really enjoyed this series. And even though I don't continue Naruto with the manga or watch Shippuden, I still like to rewatch old Naruto episodes.