HKs are decent, they are just overpriced and overrated, like everything on the internet with a cult fanbase. Roller locks are my favorite mechanism, the way they work is so fucking cool, but I wouldn't call them mediocre.
Turkshit is hit or miss. I've seen good and I've seen terrible.
I'm glad yours has no issues. What sucks though is if you ever develop one, you are way better off seeking out a HK certified armorer than you are sending it back to CAI. CAI is known for fucking up guns worse than they got them.