Orphans of the Sky by Robert A. Heinlein

 The concept is good. The writing is good. The characters... correction, some of the characters... no... one of the characters was interesting-ish and drew me in.

That isn't enough though. What I found most lacking was the world. There was the potential for a lot of interesting cultures, locales, flora and fauna, but instead there was only the bare minimum needed. The world felt sterile and empty with only a small hint at something more. Mostly through use of culture-specific swear words, but even this felt only half-finished.

Heinlein is a good author. I know he is skilled and not one to be underestimated. This though just felt like a writer creating in order to put food on the table (which, no judgment, you gotta eat). If there was passion put into this book, I never felt it.