There is little doubt it's very easy. There was a guy show up here a while ago and complained it was hard. He was mocked. I have played half the game on nightmare without getting killed.
It's obvious it was made that way so that console players would have an easy time.
I played through Rage on nightmare without being killed at all.
But that's got to do with Rage's upgrade system which makes you almost invulnerable if your clever at using your resources meaning using the right ammo for the right enemy and getting all armor/health upgrades before things turn serious.
Saying that Rage is easy because it was made for consoles assumes that console games are usually easier than pc games.
I heavily disagree on that.
I play pc and console games for more than 30 years now and the most difficult games i've ever played were released for consoles and not for pc.
PC games always gave you alternative ways of playing a game before somebody even thought about this in console games.
Most pc games always gave you the option to save your game wherever and whenever you want when most console games still couldn't be saved at all and had to be played through in one pass!
In fact i preferred playing on pc for years as console games sometimes turned out to be so frustratingly difficult i was actually wondering if the game desingers played their games themselves before releasing them.
That modern games are easier to play than the ones released 10-15 years ago is the result of games turning into mass market and has got nothing to do with the platform they're released for. Even casual joe should be able to complete a game otherwise he won't buy it.