My experience is limited to two guns. I own a circa 1967 PP in .32 Auto which is marked "made in W. Germany" but was most likely made in Manurhin, France and assembled and proofed in Ulm, W. Germany. My gun is of good quality and reliable but can be somewhat picky about ammunition in that it doesn't seem to like U.S. manufacture FMJ ammo. With European ammo like S&B, Fiocchi, or Prvi Partizan or U.S. made JHP like Winchester Silvertips, however, it is very reliable. I suspect that these sorts of ammo are loaded a tough warmer and are closer to what the gun was designed to shoot.
The other gun with which I have experience is a PPK/s in .380 Auto which was owned by my dad which was an Interarms gun made in Alexandria, Virginia. Dad had reliability issues with it and eventually traded it off for a Ruger LCR .357 Magnum. To be fair, however, I think the reliability issues with this particular gun were not due to the quality of manufacture, but rather to the combination of .380 recoil and a grip too small to fit Dad's hands (I didn't have issues when I shot the gun, but Dad's and my own hands are shaped differently).
FWIW, I've heard and read of fewer issues with guns in .32 Auto than those in .380 Auto. While I can't say exactly why this is, I suspect that the fact that both the PP and PPK were originally designed and chambered for .32 Auto may play a role in this (.32 was the first chambering offered though .22 LR, .25 Auto, and .380 Auto followed shortly thereafter).