Which produces the worst finish product: videogames adapted into movies, movies adapted into videogames or books adapted into videogames?

Movies adapted into video games are almost always terrible.

Video games into movies isn't too bad but they're quite rare and are only good if done right.

I've never heard of a book becoming a video game.

Movies adapted into video games would be the worst finishing product.

But Movies can be adapted from books, so I guess you could choose the latter and explain that the movie came from a book and then became a game. But if you want a straightforward answer...

Movies adapted into video games would give the worst finish product