Predators, what the hell is with this rule of three?

This review is on Predators, and let me get back to this rule of three. What the hell is with there being three predators in these newer movies? I will warn you now, the previews are a lie, and one of the scenes are very misleading. When Adrian Brody is standing amidst a bunch of rocks at night and all of these predator red dot sights cover his body makes it look like there are several predators. ...Well that scene never occurred, and only three predators made there presence known in the movie with a fourth in the wings. What I did like and thought was innovative, the director Rodriguez took initiative in creating separate factions of the predators. The smaller ones which are the predators that we all know and love, then there are the bigger ones that are the main hunters in the movie. Though this move was unfamiliar a change and some back story was welcome, and allowing us to know that these two factions were at war...or at conflict with one another. The story starts off with Brody free falling through the air onto the alien planet. Not really a sound opening to a movie but it has significance during the rest of the film. The plot of the film is very simple, stay alive and kill them all. I am a fan of this franchise, I truly am, I collected the alien versus predator comics, I had the predator toys when I was a kid. I loved the original movies, the AVP films were terrible, and in this movie I sought after redemption. I didn't get all I wanted but enough to satisfy me until something better comes along. I give this movie 2 out of 4. I don't know what could bring this or the Aliens franchise's back from the brink. But this movie was a good start.