I'm actually a weirdo, I liked both Alien and Terminator better than their sequels, but I know a lot of people disagree with me on it. Like I said, definitely arguable. T2 and Aliens look to me like where Cameron really found his voice and style of directing in a way that Terminator did not (the legal battle in Terminator was pretty interesting though!). You're just salty about Robocop because it was so anti-capitalist I think it was a really well done, strange little gem of a movie that likely wouldn't be made today because it's so bizarre. Mixing sci-fi, propaganda, anti-capitalism, with insane gore, slapstick violence and a Jesus Christ metaphor? Crazzzzy man.