I'll take the middle ground on this one.
Yes, standard Sig's are really just 'working class' service-type pistols. Not collector pieces. No highly polished, hand rubbed deep Royal Blue finishes. No velvet-lined boxes.
Doesn't mean each individual owner doesn't take pride in his/her particular gun, though.
It's one thing to repair one of 100, 500, or 1,500 agency guns and ship it back with an extra nick, scratch or marred spot unintentionally added ... it's just going back into someone's holster, where it's going to collect service marks/scars ... but it's another thing to do the same thing with an individual public owner's pride & joy.
I wouldn't necessarily let a couple of required repair instances sour you on the Sig Sauer pistol line, either. Guns in the real world often require maintenance repairs and technician/armorer support a bit more often than some individual 'owner/enthusiasts' may experience.
The different design of the extractor used in the American-built 220 .45 stainless slides, and the potential for the occasional tight barrel, were discussed in the Sig Sauer pistol armorer class. Easily addressed,
if encountered in a particular gun, and your repaired gun ought to provide fine service for you as long as you maintain it as recommended.
Have you taken advantage of watching the video clips at the manufacturer's website in the Maintenance Guides section of Customer Service, and downloading a copy of the PREVENTATIVE MAINTENANCE GUIDE?
http://www.sigsauer.com/CustomerService/MaintenanceGuides.aspx
http://www.sigsauer.com/CustomerService/documents/PREVENTMAINTGUIDE.pdf
If you're really dissatisfied with the condition in which your particular pistol was returned, call and see what they're willing to do to satisfy you. Can't hurt. At least give them a chance to decide it they want to address it.
Don't think that this type of thing couldn't occur with any of the other major manufacturers, either.
Annoying, disappointing & frustrating, sure ... but there you go.
It's your choice whether you want to deny yourself the enjoyment of owning and shooting the gun, which will probably acquire marks, scars & tattoos in your hands (if you're anything like the rest of us, anyway).
It's your choice, and your choice is the only one that really matters (to you). Whatever you decide is right for you ... is right for you.
Best regards.