I actually wasn't that fond of Part III as a kid. After going to the (then) future in Part II, I remember being annoyed that the whole movie took place in the Old West. But as I got older and developed more of an affinity for westerns, I came around on Part III. I rate II and III about equally. Neither is good at the first but Part III has at least aged much better than Part II the further we get from 2015. The train sequence is also a better third act setpiece than basically retreading the events of the first movie.