I don't regret reading Naruto, or even starting it. I more so regret finishing it. I regret getting so invested in it that I spent hundreds of dollars on merchandise that I don't even use till this day. I wonder what it's like to be a fan and embrace the things you love (and will continue to love years later). I can't do that now because Naruto gave me a bad taste in my mouth, and it was the only series that I've ever invested in like that. I feel like I was ripped off, honestly. Like 10 years worth of ripped off.
When I started Naruto in 2006, I was going through an incredibly hard time in my family. Seeing a new Naruto episode each day was incredibly soothing and relaxing to me. I wonder why it was Naruto that gained so many fans all over the world... While I never invested money for Naruto (my parents didn't think very highly of mangas; now it's like whatever XD), I invested hours of sleep and concentration when a new chapter would arrive and possibly completely catch me off track. Ugh, I can't guarantee that I won't get invested intensively into other mangas in the future, but if a series is about to end, I will always look back at Naruto and try to keep my expectations low.