Feeding issues. Inaccurate. Poorly finished. Sloppy triggers. My "vast" experience is only with 3 of them. Century arms importer too. Go figure. You mentioned those being bad.
Feeding issues:
I've had those. (century guns) what I like about AK's is e first 3 mags out f them will tell you if it has issues or not.
They went back to century, no issues.
Inaccurate:
Compared to what?
M1, M16, and AK all had 4MOA accuracy standards.
Only AK's I've found that won't do that we're the badly built ones with key holing issues. (went back)
Finish:
Couldn't care less. I can dura coat and parkerise.
Then there's Krylon.
Triggers:
Some early WASR's had "ground down" POS modified full auto triggers.
A $22 G2 trigger assembly fixes these (which are rare now)
You mention 3:
No offense, but I've built dozens, and messed with hundreds.
They have their limitations, but inside 300-350.....
I have a WASR wi over 19,000 rounds through it. I'd depend on it with my life.
I knw of others with higher round counts....