Terry Pratchett’s “Nation” is also technically a Young Adult novel, so it’s not that reliable as an indicator of bad writing.

(Nation is fantastic by the way)

“The Return of the Time Machine” by Egon Friedel (german title “Die Rückkehr der Zeitmaschine”, I doubt it’s actually been translated).

The only redeeming quality is that I paid only 2€ for it, but even that feels a bit high.

It’s a series of fictional letters between Wells and Friedel, with the latter aggressively misunderstanding the original book and physics. That’s all I remember, I don’t think I finished reading it, but it’s probably still in a box somewhere