I'm one of those rare people who seems to have never gotten a lemon from any higher end production knife company. Short of some soft screws stripping out all of my knives in the 100+ price range have all came to me without issue, usually always centered as well with no fit and finish issues.
But when it comes to cheapo knives, ones without a stellar reputation, I have had some junk, but I can't really count them as dissapointments because I never expected anything great from them to begin with. Mostly I will just throw a cheap knife in with my actual purchase to round up the price to a nice round number. For example when I bought my Hogue EX-01 I threw a couple of Hultafors and Mora knives into my basket to try and round the price off to £250. Then I noticed it was say £12 short so I threw in a cheap Walther knife as well, because why not it comes in a nice box and looks like a good letter opener. It was a Walther MPK, and is hands down the worst knife I have ever had the displeasure of not using. I say not using because when I attempted to use it, the blade swung back on itself, and now has a 360 degree range of motion. The pivot pin broke, so I shoved a stainless pin through it and peened it over. Wasted 10 mins doing that, and now I have a knife that can almost be closed in 2 directions.
The biggest piece of junk i've ever seen in my life, oh and ontop of that, it has the worst heat treated 440C i've ever seen, the box it came in is nicer than the knife, it came with a little nylon case as well, which again is worth more than the knife itself.