I’ve only read Ringworld from that list (earlier this year). The story did a cool job of introducing the concept of an orbital ring and giving it a sense of scale, plus introducing some other cool concepts/ideas. It also introduced more species and planets and technology that made sense for a big Star Wars-like space opera book series. It was definitely dated as far as how female characters were written, though.
I thought Consider Phlebas did a better job of using a Ring World without it being the whole plot on its own, but I suppose Ringworld had to walk so others could run with it.