Yeah, I think Buffy was so much bubblier and 'shallow' I guess in season one because she hadn't faced all the dark, hearbreaking things she would see in later seasons. I mean, like you guys said she was sixteen, a time when you do just wanna have fun, you're not really caring too much about the big picture. But, I think Prophecy Girl is where Buffy does lose her childlike innocence (if not her bubbliness) as she realizes she has to do the right thing even if it means sacrificing her own life when she sees what the vampires did to Willow and how shocked and broken she was.
I think it's fun though seeing Buffy like this, you know more concerned about cheerleading than Slaying. Coz when you watch like season 5 onwards and you're feeling very deep and you know slightly down, haha, you can flick back to season one and get that feel good boost which I think the season puts across.
And as for Charmed references, I was briefly a charmed fan but i'm a purist in that area i.e i only like season one and personally I believe Buffy to be far superior. However, if you want a good board, I'd say Charmed-Net not Prophecy, as it is pretty cool and it's filled with as much Buffy fans as Charmed fans which you know makes for good boardiness (okay board pimpage over..)