The 1st terminator is a classic, the 2nd is just James Cameron showing off the sfx. The 3rd gets it back on track. It's meant to be dark and apocalyptic.
As for the plothole, I just think that maybe John had a different father. Maybe Sarah met some guy that night in the diner. John could still have been born and still have led the resistance.
As for the plothole, I just think that maybe John had a different father. Maybe Sarah met some guy that night in the diner. John could still have been born and still have led the resistance.