Only the cheap stuff, was bad. The mid to upper end was in general excellent.
There were a lot of bad cars, but very good ones as well. The Morris minor was excellent. You still see a lot on daily use. The Mini created the transverse engine revolution.
There have been a lot of terrible US cars as well. I had a 1973 Olds Custom Cruiser, that was the worst car I ever owned, run second by my Chevy Equinox. I treated it gently, but it had to have new pistons at 70,000 miles and then broke a piston at 138,000 miles and I send it to breakers yard.
That locked all the wheels up and made an appalling noise. I nearly got rear ended and that vehicle swerved by me in angry fashion. I got out to see if there was oil and antifreeze on the pavement and the lady behind the bad tempered guy, stopped and got out as she thought the other driver had shot me!
So now both our cars are Toyotas.