Carmack on Rage in his own words, when giving the QuakeCon 2011 keynote (most important bit is probably after the ellipses):
"If you've seen me I've been spending a lot of time over there [at the demo stations] just watching people playing, generally with a big old grin on my face.
"We had so much that we set out to do on this that was different than what we had done before. Id had been almost a stereotype of what you do - first person shooter, run and gun, corridors, monsters jumping out at you, this type of thing. We invented this genre and we followed it for a long ways, but people thought that was all that we were doing.
"And with Rage we set out to be really pretty ambitious, to do a lot of things that we had never done before, and in hindsight knowing that it took six years, we would look back and say, 'Maybe we shouldn't have been quite as ambitious, maybe we should have done a few more of the things we had plenty of experience doing,' but in the end everybody gets the benefit of... we picked hard battles, we fought all of them, and in the end we did a really damn good job on it.
[...]
"It really is probably the most enjoyable id game, from my perspective, that we've ever made. I've played all of our games to degrees, but I was never one of the people who could spend eight hours deathmatching. I know there's a lot of you out there, but that was never kind of my take on our games.
"The pacing on Rage allows us to go ahead and have a game where you have moments of abject terror and intensity, and it's nicely balanced by the areas where you're going through, you're exploring, you're talking in town and doing these things. And we learned a lot through this process. By no means are we ready to be stood up next to Skyrim or something as an adventure game -- that's not what we're doing -- but it is clear at this point that there are beneficial things we can add to the gameplay experience, where we take everything that was fun and good about classic id games, and you can do these other things that add additional layers to it, that don't take anything away."
(Watch the keynote at http://www.youtube.com/watch?v=4zgYG-_ha28 )
Carmack's take on his own game seems to be a very very far cry from the parent article's "blame the artists!" whinging. It sounds from what he says about his own take on the game, and probably more importantly from how genuinely excited he seems up on stage, that Rage's mixing up the tried and true id gameplay formula was, personally for him, an exhilarating breath of fresh air.