What are some publishers or editions that should be avoided at all times.
Penguin really is poor quality. I still buy them sometimes for an inexpensive option but only if the work was written in English. Their regular line just uses inferior quality paper and bindings which do not hold up to repeated use.
Their nicer editions have no problems and can even have good translations.
Richard Pevear and Larissa Volokhonsky
Literally nothing wrong with Penguin English editions if you are buying used