Overweight, over-sized, overbuilt, overly thick folding pry-bars; in other words, most popular trendy "tactical" knives. Thin blades cut better than thick ones; thick blades sell better than thin ones. Go figure.
Cheap sprayed-on coatings instead of decent blade finishes, especially mall-ninja tiger-stripes.
Juvenile motifs (flames, skulls, dollar signs, etc.).
Flat, ugly slabs of textured black G-10; looks like a ping pong paddle or a rubber floor mat (as well as Zytel, Delrin and other cheap plastic handle materials.).
Overtly militarized, aggressive, faux-"hardcore," ugly-for-ugly's sake designs (most Emersons, Striders, ZTs, etc.).
Cheap galvanized trashcan finishes (stonewash, etc.).
Trendy, semi-functional blade grinds ("tanto," chisel grind, excessive recurves, etc.).
One of the keywords in the above list is cheap: Cheap finishes; cheap coatings; cheap handle materials, and the ridiculous "tactical" marketing trend that attempts to validate these cheesy shortcuts as desirable "features" that are somehow worthy of inclusion on "high end" production knives, and even some very expensive customs. Talk about laughing all the way to the bank.