I don't like to get into the NEA stuff too hard because I know too many of the people involved, and I don't like to get into situations in which my objectivity is hard to establish...but I know for a fact the "more flaws than any other manufacturer" statement is not based on any numbers at all.
People here sometimes forget that CGN is a tiny part of the Canadian shooting community; NEA has a terrible rep here for reasons ranging from valid to factually wrong. But I have seen their actual return and repair rates and they are not at all out of the ordinary for an AR manufacturer. The overwhelming number of issues they have can be directly traced to the fact that they sell a lot of their guns to people who don't really know much about ARs, simply because of the price point.
And RF is right...those same bolts were purchased by at least one other (and IIRC three other) manufacturers whose names everyone here would recognize.
I hate to appear to be a fan of ANY manufacturer except maybe BCM, who've been exemplary in my experience, but IMO the reputation NEA has on CGN is fairly inaccurate. They've had phases where they manufactured or resold really substandard parts, but I've seen people slam NEA who think DPMS has never had junk phases.
So to the OP, I'd say take CGN with a massive grain of salt. There are really valid critiques of some of NEA's decisions and past business practises, but personally I wouldn't hesitate to run one of their current production ARs. I have one of their early ones, which I bought with my own money after doing a level of research I GUARANTEE nobody here has come close to on the company, because I wanted to see how it would do.
It's done fine and I still shoot it. I think it's just under 4000 rounds now, mainly because I have a bunch of ARs and I spend most of my time with 16" (or thereabouts...yeah, looking right at you, CC) guns with low-powered variables, and my NEA is a SBR with a red dot.
I'm not telling you to get an NEA, nor am I telling you NOT to get something else. But I am telling you that if you did get an NEA, odds that you'd be unhappy with the performance of the gun are no higher than a lot of other manufacturers, and lower than plenty I could mention.