I loved this one. Much, much more meat to it than the dinosaur droppings they had on last week. Jex's self-sacrifice was too predictable, and I kept hoping for a clever twist to get out of that, but turning the Cyborg into a sort of 19th century RoboCop redeemed the story. Really, the episode was about the Gunslinger's journey and not that of Jex.
Ha, yeah I was definitely getting a strong Robocop vibe from him.
I loved that final, quiet scene between him and the Doctor, where he realizes he has no more reason to exist and suddenly comes across as this very tragic and human character. That to me was more compelling than all of Dinosaurs put together.