I have a comic book to add here!
I am a big fan of the Asterix & Obelix comics. They come from france, but I know they have been translated to many languages. The series was made by 2 persons - the artist and the writer. The writer died, the artist continued on his own, and it showed. The quality gradually slipped in the following books, but the last book was a pure travesty that I never really got over.
You see, the basic premise of the books is that there is a small village of Gaulles who bravely oppose the romans in 50BC. They live in a tiny village in France, and the romans (led by Julius Ceasar) keep trying to defeat them, but fail. The comics were witty, clever, funny, had some nice hidden references to famous persons, places and events of the time the comics were written. At the same time, it actually got quite some of it's facts and details right and made a lot of nice little twists on them which were joy to discover! The main theme was almost always some kind of conflict between the romans and the gaulles.
But the last book...a kind of purple micky mouse looking alien drops into the village and has a problem with other evil aliens. Those evil aliens create clones that look like superman. The gaulles have to protect the friendly alien against the evil superman clones...
I was reading it and just...stared in disbelief.
I gave it to my father, and told him to read it once and please don't spend money on another copy. And when he'd be done with that, burn it. I'm really against bookburning, but this book should be wiped off the face of the earth, so we can all forget that it ever existed.