In more linear types of media, you are correct in that sequels frequently fail to live up to the high bar set by the original.
Games are different in that they are more iterative. Frequently, the developers can take the framework of the original and flesh it out in the sequel, spending more time focusing on presentation, story, refining gameplay mechanics, etc. I think games really buck the trend when it comes to sequels sucking.
In more linear types of media, you are correct in that sequels frequently fail to live up to the high bar set by the original.
Games are different in that they are more iterative. Frequently, the developers can take the framework of the original and flesh it out in the sequel, spending more time focusing on presentation, story, refining gameplay mechanics, etc. I think games really buck the trend when it comes to sequels sucking.
I mentioned a bunch of examples below, but a constant deluge of sequels is what created "games as a service" to begin with.