I’ve shot 10s of thousans od rounds of Russian ammo including Tula through AKs, ARs, Mini 14 with never a problem. Never seen anyone have a problem with it. Why the bad rap?
The steel case ammo seems to have more tendency to get stuck in the chamber. Some claim the Tula is a little under-powered as well. AK 7.62 ammo has a tapered case so is usually less of a problem. You might get more extractor wear with the steel case as well.
Dirty powder is the most obvious. It’s no big deal if you are diligent and disciplined in cleaning your firearm.
Jams are arguably more common with the Russian ‘brass’ although that is more subjective.
Thirdly the ‘rap’ includes accelerated wear and tear from the casings and irregular tolerances.
Glad you have had good results. My ‘cheap’ ammo is PMC.