You are all doing the same thing when calling manufacturers' products "junk": referring to a nonspecific time period or limited sampling.
Bachmann's early HO stock wasn't bad. The U36B, for instance, produced prior to 1977 had a diecast frame. But Bachmann, or Kader after Bachmann Bros. was sold to its Hong Kong manufacturer and became Bachmann Industries, cheapened its product line to compete on price point with Tyco in the 1980s. In the late '80s, Bachmann began planning an upgraded line, Spectrum, with metal frames that looked and ran better than its train set products. Today, very little of the cheap product line remains in production. And Bachmann competes on the high end, as well.
Tyco did have a cheap product from the mid-1970s until Mattel purchased the company in 1997. But you either forgot or didn't realize that the initial years of the Tyco brand name in the early 1960s was the ready-to-run wing of Mantua Metal Products, which manufactured diecast metal steam locomotive kits and metal-framed and metal truck rolling stock in New Jersey. Mantua's early diesels weren't too bad either when its truck-mounted motors had metal frames. The quality slipped as Mantua began replacement of old diecast-oriented tooling with injection-molded plastic designs, first on parts such as steam pilots and cabs and then on small steam boilers (its 0-4-0 Booster and Shifter models), but slipped more after Mantua Metal Products was sold to Consolidated Foods (Sara Lee) in the early 1970s and became Tyco Industries, with all production in Hong Kong. (In the 1980s, Mantua's original owner eventually began producing products equivalent to its 1960s line again and made its products in New Jersey again, but it had no connection to the Tyco name or Tyco Industries at that point.)
Life-Like initially emerged from old Varney HO tooling, in part, in the 1960s, but quickly decided to compete on the low end of the hobby. But in the late 1980s, that changed. Life-Like began producing metal-framed HO locomotives similar to Athearn's line and more refined, all in China. Life-Like was eventually purchased by Walthers, which concentrated mostly on the higher hobby end of the brand.
Bachmann and Life-Like followed the same production pattern with their N scale lines over the years.