I just cannot think of any. I had all the typical "scout" knives when I was younger, took them to school and abused them as any kid would do.
They also abused me from time-to-time!

Got an original Leatherman when they first came out, still prefer LM to this day. I've had a Gerber and SOG as well, and they were fine.
Since I started buying "tactical" knives in 1992 with the purchase of a Spyderco Police, I cannot say I've had any real junkers. Sure there are some I have been dissappointed with, not gonna name them as that has been discussed to the death some time ago, and I was taken to task for upsetting the brands mafia.:yawn:
Other than that, all of them, even the Mission MPF titanium, that holds an edge like butter, have been mostly livable knives. Even if they now live in a display case.
Now I do have two unnamed knives that my dad bought me for Christmas some years ago. One is a BIG bowie type, obviously made on an Indian reservation, handle full of jewels and stuff. He bought it at a truck stop in Arizona or New Mexico when he was driving the rigs. Useless floppy-ass faux leather sheath that the knife will poke through if it gets wet. The other is some double-edged freak thing that looks like something from the renaissance era, complete with scabbard. I do not have any clue what he was thinking when he bought that one? I do not even bother to display these, they reside at the very bottom of my deepest drawer full of holsters and sheaths bought over the years, sight unseen.