I got into Glocks a couple of years ago. Here in California, Gen 3 guns are the norm in new, as Gen 4 are not on the approved list. All eleven of my Glocks are Gen 3, and six were new when I bought them. I own a 17L, a 19, a 21, a 21SF, two 23s, a 26, a 30, a 30SF, a 34, and a 36. Other than a few WWB rounds that failed to fire - in any gun - I have had no failures of any kind. I carry three on my CCW - the 26, 30 and 36. I shoot about 5k rounds a year through them.
I generally don't have problems with ANY of my guns. Other frequent shooters include a M&P 9c, a Shield 9, a Sig 2022 9mm, two Colt 1911s, a Baer SRP, a 22/45, a Browning 1911-22, and a couple of .22lr conversions from Kimber and Advantage Arms for 1911s and Glocks. I don't shoot my revolvers much, but no problems there, either.
I rarely clean my handguns - I just wipe 'en down to keep my hands and clothes clean. Every once in a while I will field strip them, brush out the gunk, and lube them lightly. I only detail strip if I'm replacing parts - which is very seldom.
I believe many problems with modern firearms, particularly autoloaders, stem from owner maintenance/modifications/improvements. I keep mine out of the dirt, don't take them apart without cause, and shoot the heck out of them. YMMV, but it works for me!