All Systems Red

This doesn't have the world building of Well's other series, but the main character is so great that it doesn't detract from the book at all. It's a quick read and a great intro into the rest of the series (which should be read in order). It's not set on Earth, but it's not bogged down by space tech like some sci-fi books can be, so even if you're not a sci-fi junkie it's worth a try. The audio book narrated by Kevin R. Free is amazing too - he does such a great job giving voice to Murderbot's sarcasm and social angst.

Great story telling. Characters you actually want to know. Appeals to a wide audience but has enough hard-sf Easter eggs to satisfy us geeks. Just get it. You know you want to.