Moreover, it seems RTD is a huge fan of Joss' work and claims that the Buffyverse was sort of the inspiration for Torchwood
Well, yeah, it was pretty obvious from Day One.....err....well, "Everything Changes", actually....that Jack was doing a serious Angel impression.
Actually one of the things that hurt Torchwood's credibility in the first year was that it was so obviously trying
to be the Angel to Who's Buffy, but also so obviously falling short. In year 2 they started taking themselves less seriously, and that really helped the feel of the show get past that comparison.