Comic books and video games, while being niche media compared to films, are very different in that the former is very much a straight linear narrative.
eston summed it up pretty well, but for a couple of decades now we've been at the point where the video games themselves are presenting better "movie-like" experiences than any movies of them ever could. All that and interactivity.
There's a long-held social pressure to use being a movie as a litmus for how "legitimate" an IP is, and it's not just video games, of course, but TV shows, stage plays, books, comics, just about anything fictional.
But quite frankly given the trends these days, that concept is nothing more than nostalgia. TV shows are putting together grander narratives than film, comics can do unique things within their medium that no other can, etc.
If someone's going to make a video game movie, the first thing I'm going to do is wonder "why", and then if I'm halfway interested, I'm going to set my expectations WAY low so I don't worry about being disappointed because the movie doesn't match what I believethe property's established lore should be.
So too did I do it with MK2021 and I was quite entertained.
A pet peeves of mine in video game movies are fanservicey moments when they forget they're supposed to be a movie and try to replicate something in a way that's similar to the games they're based on. It usually have corny results. Stuff like that I'm not crazy about.
I wish more of them would be in the mindset of being a good movie first and foremost, and then being a movie based on a video game.