None of these are necessarily a deal breaker, but I generally dislike these features or traits:
Tip down carry only--I just like tip up. Personal preference.
Liner lock--don't care for them compared to other locks, but will use them if the rest of the knife design is good. Again, personal preference.
Spring assisted--more parts to gum up or wear out, and I'm plenty fast with just my thumb, thanks.
Recurves--don't have a use for them.
Combo edges--give me all one or the other, please!
Massively thick blades--I find little advantage to adding weight to the sides of a blade. Make it more vertical if it must be heavier, please!
Massively thick blades on FOLDERS--Makes even less sense to me.
Finger notches for multiple fingers--anything more than one limits your range of grips.
Quality knives with crappy sheaths--If I'm going to have to get a custom sheath made for the darn thing don't make me pay for the one I'm just going to throw out.
Hyper-aggressive handle texturing--Just make it ergonomically designed and it should stay in your hand fine,
without shredding my pockets and giving me blisters. Fortunately this is usually easily fixed.
Chisel grinds--especially on knives with double primary grinds. Chisel grinds on their own are not useful to me, and when the edge of a double-primary knife has a chisel ground edge (a la Emerson) it makes no sense.
Left-handed serrations on knives with right-handed locks--Only done because it makes them photograph nicely. Not optimum for performance.
Jimping--creates hot spots and doesn't prevent my hand from sliding on it. I'd rather have a straight spine with the edges rounded for comfort.
Thumb ramps--Seemingly always too close to the handle because they "look nicer there." When I extend my thumb on the back of the blade I want to have it OVER the target I'm cutting for maximum power. The only guy I know who does them right is Dylan Fletcher.
Tanto tips--They have their uses but they aren't generally for me.
I'm willing to overlook a couple of the above on a knife if the rest of its qualities stack up, but they all count as marks against it in my book. A lot of folks like many of these features and I'm happy for them, but they just aren't for me.
