Not enough content. No NPC re-spawning. You have mission that raiders raided a town they should still be in town, and it's up to players to kill them before taking over town under control. More town raids. enable weapons in all towns.
And I almost forgot, I want to steel rides from my enemy and keep them.

More content would be nice, I agree. But sandbox it? Why? No reason every game absolutely must be sandboxed.

Sandbox make it more life like and interesting.

Why though? It's a FPS and a good one at that. An rpg is something different then rage. It cannot be openworld, it would ruin the game. I think your wanting Borderlands 2. The few rpg elements that Rage has are just a perk. They were put there to make it a little more fun. Really anymore rpg and the game would be ruined.

I think there should be more to occupy the player out in the Wasteland. More on-foot shooting and exploration (hidden areas, saves, whatever). Random encounters with groups of mutants. Random road blocks by bandits. I don't know, something more to do if the player wants to spend time freestyling in the Wasteland a bit.

I don't think we should be able to steal cars though - this isn't GTA.

Why? It would be nice if we could steal cars and sell them to merchants as well.

Or salvage them to enhance your own ride.

Or/and that too.

Yes this is a good fps I've thoroughly enjoyed it but...... does anyone else feel it's not that much more difficult on nightmare mode? As far as I can tell u jus take more damage.