This is a sequel (not a prequel) to the two Ring movies starring Naomi Watts in the early to mid 2000s. It is mostly a reboot, and part continuation of the story. The original Ring video tape is found, then digitized making it easier to have a tail watch it, so the original watcher does not die (in theory at least). As you can expect the execution of that ends up a bit off.
The movie attempts to add to, and in the process change part of the Samara story line. So while parts of it line up with the original movies, parts do not. I will not go into great deal for those who do not want to be spoiled, just know that it is not a traditional sequel to the story line told in the earlier films. The acting and writing are about what you would expect. It is okay, but not great. While it is still mainly a psychological thriller as opposed to a gory one, it was toned down even more from the earlier movies to get a PG-13 rating.
For extras, there are a handful of making of and behind the scenes material, then about 20 min of deleted and extended scenes. Okay for what is there, and clocking in at about 45 min, which is fine given the movie itself was only about an hour and a half. I fall firmly in the middle on this movie. I do not love it, but do not despise it. You would not be missing anything noteworthy if you skip it, but if you are looking for a thriller, bordering on horror movie, then this is okay.