It's very simple: those two are not the same media. A movie, a book are made to tell a story. A video game is made for playing, not for telling a story. They should stop adapting video games, it's pointless.
And books often are even harder to translate the story aspects for because they usually take place over much longer time spans than movies or video games. Many movies made from books seem to have character relationships that seem like they should have taken much longer to develop because of it.