Of course it's not whole-hearted! I think Tom Araya is just a guy with a solid brain in his head who likes to smoke pot and happened to end up singing and playing fucking amazing bass. What I meant by "regression" was that it seems that the intellectual side of Araya, King and Hanneman really started to come out of the woodwork on Seasons and Divine Intervention, then there was a long hiatus (highlighted by the amazing, incredible Undisputed Attitude) followed by two albums that, despite their musical complexity and flawless delivery lacked some of the humorous, but wisened philosophical explorations of the previous work. 213, whle comically graphic and descriptive, is a chilling psychological examination of a serial killer/cannibal. We have to laugh and headbang, but I find myself thinking at the same time, if that's possible. If that's possible then Slayer did it - for a while - and then they stopped.
The lyrics on GHUA are without depth. Sure they're aggressive and work well in the thrash/death context, but I had come to expect more from Slayer.
As for Metallica they're new music has actually GAINED a great deal of lyrical strength. Metallica, and particularly James Hettfield, have become adept songwriters while, perhaps unfortunately, abandoning their classic thrash chugfest. Still, there are some really strong words on both Load and ReLoad, both much stronger and more ballsy insights into Hettfield's mind. Not an altogether twisted mind, as he would have like you to believe in the AJFA days, but a mind that has seen a great deal of pain. James is a master, to this day, of reaching in and grabbing hold of that pain and sending it throatward. All this despite a few tracks that kind of made me do this...