I have owned a few CRK Sebenzas and Mnandis. One Sebenza had an uneven blade grind, but it just took a little extra time on the sharpening stones to make the blade a screamer, then it was fine. One Mnandi had a problem with the heat treat on the lockbar face, had the stickiest of the ickiest locks you've ever seen. I called CRK, they said send it in, the fixed it, and they sent it back to me without charging return shipping, like they claim they will all over their warranty copy. That's a-okay customer service in my book.
Having reground a few of my knife blades, I can attest that it ain't no easy chore, probably even after experience. The rate at which metal gets removed is staggering. Unless the blades are machine ground, then I don't think expecting every blade to be perceivably symmetrical is reasonable. I don't even think that expecting perfection about the mechanism is reasonable.
Having said that, even the CRKs with problems were nicer than pretty much every other production knife I've owned, save for some traditional slipjoints.