What makes a good video game movie?

I know many video game movies had a bad reputation as some doesn’t follow the original material or generally a bad plot. Of course some people like these movies but it makes wonder. If I was to make a video game movie, does it need to follow the games’ stories?

Does it need to follow the source material like the story, characters etc anything that consist in the game or can bend a little to make the movie slightly different from the games?