Well, I guess you'll NEVER buy a new vehicle again.

They ALL come this way, right from the factory. Take a peek when they're still on the transporter truck.

Surface rust on raw steel is normal. It's rare to see a painted driveshaft, but did have that on a 1990 Amigo, but it still had chassis rust.

How do I "know" it's okay? Because these rusty items have never failed in all my years of driving. The salt here in FL, 10 minutes from the ocean, eats up vehicles, but the things you see rusted already aren't what fail. Even restored a '66 Chevelle SS. Everything orginal ('cept the BIG motor), including the lightly rusted chassis & driveshaft. Close to 500 HP, running gear held up fine to the punishment. Quarter panels had to be refurbished due to all the rust.

If you're that concerned, get some POR-15 and start painting... Otherwise you'll just have to live with it. It's only cosmedic.