I've yet to recieve a new in the box gun, that I didn't scub the bore on anyway. Every gun i've bought, has had powder residue where they factory test fired the gun. Not really a big deal. Just the factory's way of doing a quick check to make sure the gun doesn't blow up in your face... the bbl needs scrubbing anyhow... you could have the factory do a cleaning, but thats just going to jack up the price on labor, and their mostly likely just going to run a couple patches down the bbl...
I'd say that the cheeseburger analogy isn't completly correct... Thats more like saying if the gun came in without being blued... thats a more correct analogy. Because then thats skipping a crucial step in the mfg process...
We'll put it like this...If you order a cheeseburger, and it comes w/ pickles, and you didn't want pickles, scrape the pickles off and eat it anyhow... it still tastes fine, the product wasn't inferior just because it had a pickle on it...