I've never heard of someone buying a new car, later when something doesn't function that the owner knows is not normal, take it the dealer, and the dealer tells them he won't look at it until he drives 3000 more miles.
I've heard that line from my car dealer over several automatic transmission issues.
Having said that, many pistols are being shipped without the benefit of the hand fitting and small parts polishing that used to be the norm a half century ago. Some designs are simply more tolerant of that sort of, um, manufacturing steamlining than others - the 1911 is not, in several specific areas.
Also - many factors have changed the economics of things such that it's cheaper to cut out a few QA/QA steps and accept the minor increase in customer returned goods (CRG). Sig, for example, seems to have done the math very critically and determined that a specific amount of CRG is quite OK, given the cost savings they must have enjoyed from cutting out QA/QC steps during manufacture of my last couple of P226s....
A 1911 costs more to make properly than many other more modern designs. In return, the 1911 provides benefits that some find appealing. But trying to make a 1911 that is cost competitive with a modern stamped-steel-and-polymer design will almost always result in a 1911 that, across it's manufacturing run, will suffer from an increased incidence of failure.
Does that mean that the 1911 is bad? No. It simply means that folk need to understand the economics of them, and either pay more money to get a reasonable example or pay less money and be willing to roll the dice that the specific example that they bought may have issues.
Lastly, it should be reemphasized (as has been pointed out above) that many 1911 reliability issues are caused by tinkerin' or using out-of-spec magazines. For some reason, folk seem to accept a $30 Sig/HK magazine as reasonable, but then have an expectation that a $12 1911 magazine from some unknown manufacturer should work equally as flawlessly. Sadly, when the $12 1911 magazine introduces reliability issues, the tendency is to blame the gun as a whole.