I don't think DKCR's difficutly has anything to do with Nintendo, after all, the original games were pretty simplistic and the first one was a cakewalk. Retro's standard is to make highly challenging games, as was shown with Metroid Prime 1 and Metroid Prime 2. That's Retro's style.
This backs up my theory that Nintendo is the reason Metroid Prime 3 was the easiest thing since Paris Hilton--if left to Retro, it would've been just as challenging as the first two, but Nintendo gave them the singular guidance to "make it easy for the Blue Ocean crowd."







