This is one of the threads that almost turned me off Challengers. My Charger also had 'tinfoil' skin and many dings when I bought it used, but I thought it was from the previous owner's neglect (and it probably was, to be honest). I decided that I could live with a few imperfections and bought a new Challenger off the lot after a thorough inspection (the salesguy thought I was crazy). It looked flawless, but it was also shown to me filthy so I wasn't 100% sure.
Now after over a month, 2,000 miles, and quite a few washes, I can say that there are indentations at the door handles (like stamping impressions), a slight crease above one C-pillar, and slightly sunken roof seals with some denting on the seals (surely done by me). At this point it is all so minor that, although anal about other things, I can absolutely live with it. My car is black and shows everything, but it's also a daily driver and I'm resigned to watching it age cosmetically somewhat.
The sheet metal IS too thin. Just like in the timing chain thread, another one that gave me pause, I think this is the smoking gun and that everything else derives from it. Flex, manhandling at the dealership, strangers touching the car, pressure from car wash dryers or waxing... none of that would matter on another car, but it is what it is. So my advice to anyone would be to not buy a car sight unseen, to take a complete look at it before signing, then to be extra careful as an owner (no kids allowed, soft touch, and no leaning on the car ever). After that... Dodge thinks we're too picky so maybe we are? The car's a looker, but unless you take it to shows why spend so much time searching for the right light for flaws (mine won't show on photos)? It's just torture and there are others beyond the body.