Some of the ideas expressed are just amazing. I still use and love the phrase "Outside Context Problem". Excession, while not as universally popular as the (excellent) Player of Games, is still one of my favourite books.
I haven't read the last one yet. I almost can't bring myself to, in a way. Because after that, that's it. It's incredibly sad that we lost Banks so soon, obviously for his friends and family, but I would've loved to continue reading what he would have written.
Other commenters mention the dystopian future many authors project. The other end of the spectrum is dominated by nauseating projections of America utopias like in Star Trek.
For a very different yet immersive world I'd highly recommend people pick up either the Merchanter or the Foreigner series by CJ Cherryh.