Its a musclecar. Its meant to be cheap and fast. I can't even remember how many times I've looked under the car other than for work. How many friends of mine ever asked, "Hey can I look under the trunk??!"
Suck it up. Quit whining about some unimportant rust that does nothing from taking away from the driving experience.
Sit down, Shut up and Drive!
SO, you are saying the rust is ok? The fact that other cars, cheaper cars, other muscle cars don't have rust is not a factor? When does it not become ok? Where do "cheap parts" stop becoming ok? What if other parts of the car are cheaply manufactured?
I've never been a fan of mediocrity, and because I paid for this car and wasn't given it, I care that the underside looks like a s h i t sandwich.