I have only played a very limited amount of Traveller but have done a lot of reading and really like the setting and system. I'm not sure exactly why though. It's much crunchier than what I would normally like, but in a good way. I definitely like the math of rolling 2d6, as a change from all the d20 based games I've played. I suppose I just like the old school 80's sci-fi vibe in general. I wish I had given this game more attention when I was a kid.