I liked it, just not enough for 4 stars. The plot moves along at a decent pace. Djerassi has a clear, easily accessible writing style for the most part. Some of the scientific stuff was a bit much, and he quoted operas too often for my liking.
I enjoyed the first half more than the second half. The romance, sex, and international policy debates gave way to the science. But to be fair, I knew there would be science when I bought the book.