I was going to pass on this post, because I don't want to sound critical, but what the heck-
I have owned 3 Kimber 1911's, all in .45 acp. My first was a Custom Target. When new, the slide was hard to operate, to the point I thought it might not be reliable. About 2 or 3 thousand rounds later (including a lot of light semi wadcutter), and no jams. Most accurate .45 I own, including my Colt series 70 and 80 Gold Cups.
My Eclipse was also tight when new, and except for one bad factory mag, was 100% reliable and accurate. Traded it to a buddy who just had to have it.
My Ultra carry has had about 1 thousand rounds thru it, mostly ball and HP hand loads. 100% reliable, and very accurate for a pocket pistol. The slide did not seem as tight when new compared to the other two.
My experience on these forums is you cant find any make or model of gun without someone saying its no good, about how the first time they shot theirs, the hammer fell off, etc... A lot of "experts" have never owned or fired the gun in question...
Like the Ford / Chevy debate - "Well, my brother in law had a Chevy back in '86, and the tranny went, so they ain't no good"......
The truth is no major arms maker stays in business long if they make a defective product. That's not to say a bad one can't slip thru now and then; that happens with any mechanical device.
Most guys tend to modify their weapons in some manner when shooting competition, so I will ask, how many shooters had changed spring? How many were using aftermarket magazines? How often had they been dropped on the ground? How many had "fixed" their extractors / ejectors? How many were using their "special" reloads? How many shooters over-all were using KImbers? If half were, then stands to reason Kimbers would be represented during failures on the line.
I am not a Kimber spokesman, but I like them because they are well made, accurate, and have never let me down. That includes 3 Kimber rifles as well. But, I will say all is not perfect - I have a Kimber .22 conversion kit I got in trade that is very accurate, well made. It has never been 100% reliable though with any round I have tried.
My guess would be a combo of all the things I mentioned, with the magazines being the prime culprit. I was a Firearms Instructor for the Federal Agency I worked for. I don't know how many times our issue Ruger P series pistols would start to jam on the range, and guys would complain about them being "POS". In almost every case, replacing the beat up used magazine with a fresh one cured the problem.
Larry