book spoiler
i was even more of a lib when i read the series but i just remember liking the ending of the book and how the galaxy was described to fall into a 2D space because of a little piece of paper that some sniper shot from an unfathomable distance away.
also i thought the Dark Forest hypothesis was an interesting answer to the Fermi paradox.
e: i tried to re-read the series last year and petered out in The Dark Forest.
I'm really looking forward to getting to DBZ to see the androids again. I remember thinking Android 16 had an interesting character arc but it's been such a long time.
I'm watching Dragon Ball #60 so I've got a long way to go.