Rodriguez's original draft was completely horrible. It was infact a steaming pile of crap. While some ideas could fit into the Predator mythos, most of them were just outright contradictory and plain outirght stupid. He even had written in his original draft two Predators actually peeing on the Wilson character. When that happened, things stopped making sense, and what was a pile of crap turned into a puddle of diarreah.
Michael Finch and Alex Litvak's script is alot better by a thousand miles. Most of Rodriguez's ideas were thrown out the window save for a few things, and some of the newer ideas fit into the mythos but some ideas were just redundant and unneeded such as the Super Predators.
-Rakai'Thwei