Worst knife I have ever purchased was a Gerber Bear Grylls Ultra compact fixed blade. While I normally don't buy the brand, I was on vacation and thought the little fixed blade for $30 would find a niche in my EDC. I was disappointing to find out that the only thing this thing would be useful for is butter knife. The HT on it may be botched or something as the knife does not hold an edge. After using it to cut my first cardboard box with it the blade had dulled. I first gave it the benefit of the doubt and though it was dulling by rubbing on the sheath. So I sharpened it and went back at it! Two cardboard boxes later and the knife that had just shaved the hair off my arm was now struggling to cut cardboard. Looks like its going to end up as a throwing knife in the garage.
^ this 100% I got the Gerber paracord fixed blade and the "steel" is ridiculously soft. It makes Victorinox' steel look like ZDP-189. It's almost like it's made of tin. HRC must be in the low 30's.