I wouldn't know how many non-video game movies are bad, but if it's like anything else most are garbage and a few are good. But usually we know something is good because people talk about it a lot, so we only remember good. But video game movies stand out to people where they remember both the good and bad. Book adaptations, on the other hand, half of the movies people think are original are adaptations and they don't even know.
I am very interested in this now that I know it's based on a true story.