OK, I'll put in my two-cents' worth.
It seems to me that the issue isn't so much about nailing down a definition of torture, or even about whether waterboarding constitutes torture. The way I read it, it's more about the AG getting put into a situation where there's no right answer. Once again, this looks to me like more purely political bullsh!t, and a whole lot less like genuine concern about "human rights," which is another slippery term to define to everyone's satisfaction.
But as to the issue of waterboarding itself: It sucks, I'll not argue about that. It sucks slightly more than having a classroom full of wannabe gangsters, whores, pimps, and welfare brats, but less than a vasectomy. I've had all three, and I realize that all three might be subjective. There's those that would rather have a vasectomy than teach thugs, and others who would get waterboarded for hours before they'd let a doc cut on their cajones.
But if--and I say if--it really is that subjective, why are so many of my tax dollars going to try and prove or disprove an elusive definition?
However, I reiterate: I think this is political maneuvering, and has nothing to do with genuine concern for the alleged "rights" of our enemies. This is internal, domestic politics.