That is surface rust on components which is not a problem.
Pic.1, The bracket is good thick steel. The corrosion actually forms a protective barrier so I'd be surprised if that component fails before the car is scrapped.
Pic 2 Exhausts always rust. The problem arrises on short journeys when the moisture generated by a warming engine sits in the exhaust and then rots in from the inside out, So long as the engine is warm, the codensation evaporates and there is no problem. My Stilo is on 105K with the original exhaust. The crossbeam in the picture is made from thick steel tube to be able to take the weight and stresses endured whilst dricen. That again will outlast therest of the car.
Pic 3 - see above for Pic 2.
Pic 4 strengthening bracket for the wishbone attachment point. The paint probably came of in the first year, this will again last for a fair while. Pic 5. Seam rust - prod with a screw driver, that will be solid. Don't scratch because you will damage the protection underneath alowing moisture to attack bare steel. Clean it up by all means and treat but again that is normal on a lot of cars. If it were a structural area of the car, Fiat would have covered it in underseal and other rust inhibitors.
Pic 5. Rust on engine mount? Normal.
How old is the car? There is nothing there that would concern me. Fiat are no worse than most and better than many. If you have concerns, take it to Fiat, your car should have at least a 6 year anti perforation warrenty.