Arun George’s review published on Letterboxd:
It is rather strange to call this a Paranormal Activity film as very little falls in line with what we've come to expect from the franchise - one with declining payoffs. Many sequel makers tried pushing it in different directions, but it could never reach the highs of the first three. Next of Kin feels like just another cult-based found-footage film (with occasional cinematic shots, out of nowhere) that is predictable and filled with poorly staged jumpscares (except one or two, maybe!). Why do horror movie protagonists possibly make the worst decisions ever? It's such a tiresome trope!
The film's visual scale is better than it's ever been, and in the hands of William Eubank (who earlier directed Underwater), the atmosphere is built up well in the film's first act. Christopher Landon's screenplay descends into mediocrity very soon, however, making the plot points more obvious and less scary or intriguing with each passing minute. Next of Kin also commits the biggest found-footage mistake; it showcases the demon a tad too much in the final act, taking away even the slightest bit of dread by the time the credits start to roll. The performances, while not terrible, don't help elevate the movie either. At this point, it'd take a lot more effort for a found footage flick to blow my mind.