It's current rating of 3.6 seems about right. It's not great literature, or even great Heinlein, but it's a fun pager-turner. I enjoyed reading it, but I'm not kicking myself for not reading it 20 years ago.

Of course, had I read it in 1992, I would have found Heinlein prescient for predicting pocket phones, without noticing the fact -- as of sometime before 2012 -- that pocket phones mean teenage girls are never sufficiently bored in a waiting room to have to glance at a magazine or go wandering if the magazines are boring.

Though I would have still been amused by the use of a slide rule a few chapters later.