I'm a worldbuilder at heart, and the system for randomly generating planets, as well as the implicit assumptions about the setting baked into mechanics has made for some of my favorite worldbuilding.
It's a simple system at its core, but has a lot of systems that can be engaged with to create really tactically interesting play.
It's a very flexible system regarding what kind of stories you can play with it. You can be the blue-collar crew of a cargo hauler doing odd-jobs to make ends meet a la Firefly, you can be the crew of a naval cruiser a la Battlestar Galactica, or explore uncharted space like Star Trek. You can be ground troops in a mercenary company or a tank crew in a military campaign. You can be space pirates building your own fleet one stolen ship at a time. I ran a game last year that was basically a cyberpunk game with the players being low-level criminals set in a single city and it worked great.
The games been around a LONG time, first released in 1977, and with most of the different editions being 90% compatible with each other you have a ton of content out there to use for your games.