Excessive blade play in any ditection. (if I can feel it wiggle, it's "excessive".)
Serrated Blades.
Pocket Clips.
Single blade "Trappers" and other Traditional patterns that usually have two or more blades.
(A "real" "Trapper" has two blades. Hate me if you must, but consider that since they ain't for me, and I won't be buying one, that leaves more for y'all that like them.)
Dull/lacking a "working edge" out of the box or hang pack/Blister Pack.
Knives that come in a hang pack/blister pack, requiring another knife to get the new knife out.
Fully or Partially Serrated Blades.
Knives promoted as "weapons" by the manufacturer and model names that make prosecuting attorneys drool and judges and juries cringe.
Questionable/hit and miss QC.
Knives that can't be sharpened without expensive diamond or SiC stones, or powered sharpening systems.
Holes in the blade.
Serrated Blades.
Pocket Clips.
"People" (note quotes) that see someone with a knife in public and panic, for no reason.
Serrated Blades.
All the Fakes sold on ePrey.
"Nail Breaker" pulls.
(A stiff or hard pull does not make a knife "safer" ... quite the opposite, in fact.)
The attitude that some brands are made by "gods" (Mods, please note the lower-case "g") and then give those brands a "pass" on issues they won't tollerate on "lesser made by mortals" (and considerably less costly) brands.
Blades that rub the liners.
Celluloid handles/covers/slabs.
Liner and Frame locks.
Pocket Clips.
Holes in the blade, regardless of shape: Circle, Teardrop, Critter, or Critter Foot/Hoof Print.
Serrated Blades.
Studs on the blade to facilitate opening.
"Over Built" sharpened crowbars/prybars.
Chisel Grind.