I'm not sure really what to say about this movie. It follows many other movies in the same venue with found footage and what happens to the people who has found the footage. It seemed a lot like V/H/S, SINISTER and a little like VIDEODROME (1983) one of the most awesome movies of all time. PLAYBACK doesn't have a whole lot of surprises.
The movie starts with the videotaping of Harlen murdering his family. After that everything else is almost predictable. I knew who was going to die, who was going to end up being the bad guy, who was the mysterious family member, and who was going to save the day. The end of the movie was also predictable. I wish there had been a tiny bit more suspense, although I will admit there were a few scares that startled me.
I can't say I would recommend this movie, but if you enjoy movies with found footage and lots of shaky camera angles then you will probably enjoy this movie. Personally I'm a little tired of movies with shaky camera angles that follow a group of people who eventually get killed on camera.