A 90-something Ford Taurus. It ate alternators at a rate of one per 8,000 miles.
Olympia GoreTex overgloves. Whoever sewed the liners into these pieces of crap either had really skinny, short thumbs or they were playing a cruel joke. Impossible to use and worthless.
First Gear HT Air overpants. The crotch zipper lasted exactly one ride. Maybe the fit there was too snug.
Thor enduro jacket. All but four of the snaps came apart after just two rides rendering it nearly useless.
Sears Craftsman 3 ton floor jack. Oh, it lifts things fine but when not in use it takes up about 5' of floor space because the handle can't go vertical. One must remove and store the handle elsewhere. Dumb.