Making films is much different than making games, because there's a lot more money involved, and a lot more people involved. What often happens is people get involved who do not fully understand the property and therefore try to take it in the wrong direction. At that point, the producers, the writer, and the IP creators have very little influence and just have to hope for the best. Only a few people like Spielberg have cradle-to-grave authority over a project.

Via Edge