The best guitar book in my opinion is one called The Advancing Guitarist by Mick Goodrick. It has all the scales chords and theory, but more importantly it has ideas, ways of thinking and approaching the guitar that get the brain-gears turning. Instead of giving you exercises, it makes some suggestions that get you thinking about making up your own. I would open it up every once in a while, skip around, not go through it linearly, just to get some fresh perspective. It was good for that, much better than any dry theory book, of which there are plenty.
I was a twelve year old metalhead once upon a time, as well. Metallica and Anthrax led to Yngwie, Paul Gilbert/Racer X and all of the neoclassical stuff that was all the rage with the kids at the time, plenty of sweepy minor arpeggios, you know the drill. My friend and I would sit across from each other and take turns playing the Steve Vai and Ry Cooder stuff from the end of the crossroads movie, and throw pillows at each other when we messed up. After that it was all the fusion guys. Of course McLaughlin. And Zappa, especially Mothers era. Now I've gone off the deep end. Barely listen to any guitar. Lots of chiptune style video game music mostly.
In my early twenties I decided to really learn to play competently in the DADGAD tuning. I learned patterns for the basics- pentatonic scales, the regular modes, harmonic minor- and can play in that tuning just as well as in standard. When listening to it, it sounds like standard tuning, but with just enough difference (because it's not) that it stands out a bit. My main guitars are two strats, one for each tuning. One is a '77 black strat that weighs a ton and has a fat neck, just a fantastic instrument. The other is a cheap cream colored Mexican strat body with an American neck. The black one stays in standard tuning.
My drummer is an interesting fellow. He's just about to turn 60. Big Keith Moon and Ginger Baker type, but he can play jazz and punk too. He studied tabla in India for a while, and he really knows his beats. He writes these songs with all these odd time parts, but not in the usual disjointed math rock style, he swings and grooves. When we write songs, I usually come up with my parts by following his vocal line. The bass player is a solid rock guy from Philly. He doesn't count the odd times, for him it's all feel. It's a good combination I think.
I've been working on the Spoony Bard's melody from Final Fantasy II (IV). Fun little piece I fingerpick and play with lots of open strings. There's youtube videos of other spoony bards playing it, but I haven't seen anyone do it the way I do.
Not sure what the Carnatic controversy is, but you've piqued my curiosity. If you find out Joe, let us know.
Thanks for the RI guitar confessional, it's all just pouring out. Fun.

Both his words and manner of speech seemed at first totally unfamiliar to me, and yet somehow they stirred memories - as an actor might be stirred by the forgotten lines of some role he had played far away and long ago.