To be honest I think all metal-heads realise sooner or later that all though metall is a pretty free and fun play-field to be on it doesnt allow for too much musical/tonal extravagance.
I dont think they lost their INTENSITY, I think they just decided on a different approach and that a slower TEMPO fitt their needs better... (?)
I saw them live at Roskilde '99 and the Load stuff absolutely did not lack intensity.
Well thats it, I hold Metallica very very dear.. Ill be back.. less DRUNK ;P and more sober, I hope.
Laters, last beer comin up.