Been playing some more Rage, and I think I'm on the last mission in Wellspring.
The game does some things really good, like having very versatile enemy AI, I'm also always amazed at the small details especially to animations and texture variation.
The authority is fun to fight, at least on the highest difficulty (everything below is too easy), and overall gunplay feels very good. Definitely the best idSoft game, since..uhm, Doom 2?