I own and shoot 19 3rd Gens. I also own and shoot 4 Glocks (19, 22, 21 and 31). I like the Glocks, they're very accurate, light and fast. I keep them cleaned, lubed and shoot good ammo through them. All four function perfectly. Granted, they don't have soul like a 3rd Gen, but they're excellent weapons. Of course, I also like my 1911, Beretta 8000F Cougar, Makarovs and Sigs. If I do my part, they're all pretty darn accurate. Oh heck, I just love pistols.
On a side note: From about 2001 to 2007, I was shooting my Glocks a fair amount at a small local indoor range that has since closed. I was a regular there and on many occasions I would find myself shooting near folks (including many experienced shooters) with a Glock or two. Many of these folks would be complaining how it would not group, shot way left, shot way right, shot way low or whatever.
The experienced shooters would see the very tight groups I would shoot with my Glocks and say something like, "I'm getting ready to move the sights" or "I'm going to sell this one, it just ain't shooting" and then ask if I would put a few rounds through the pistol. I would ask for 3 rounds and shoot the first round in the white of the target and use that as POA for the next two. Almost everytime, at 21 feet, the rounds would be touching. We would chat for a few minutes and I would discuss how the trigger, and in many cases the grip angle, could take some getting use to. I, myself, almost threw my first Glock under the bus in 1992. But I stuck with it.
As for the newbies (almost always with their first Glock), I would go over introduce myself, ask how they liked the Glock and, after hearing the complaints, would ask to try it with a few rounds. The gun would shoot a very tight group at 21 feet. They would say something along the line of, "Wow, I guess it ain't the gun, is it?" I would then give them some pointers and discuss the trigger. It didn't make them into instant marksmen, but their groups would usually shrink significantly and move more toward center.
Since 1992 I've shot many, many Glocks and have never had one that would not shoot a fairly nice group
near POA. Of course, most all my 3rd Gens do about the same. My point is that most high quality modern pistols shoot pretty darn good right out of the box, if we put the effort forward to make it happen.
Of course, that's just me, your mileage may vary.
FWIW