The tagline for this book is "The pursuit of Joy in Singleness and Dating", I think the author fell short in this. The author seems to discourage dating and the pursuit of marriage. Or at least treats those things as in conflict of living a life for God. He assumes that single people have limitless time to pursue God and spreading the Gospel that will be lost when married. This can be very guilt producing for the young single who only ever has time for church and one or two groups. He assumes also there is only one way to serve God, forgetting we all have varying talents and callings. God did not make carbon copies who all serve and pursue Him in the same way.
This book ignores the possibility of married couples serving together in ministry as well as singles who love God, live a very good example but are living such a full life there is no room for active ministry. The author did disclose that this book was written mainly with young people in mind but the message that comes across is still suspect for that demographic.
I did find myself agreeing with many things written in the book but as an overall book there are too many assumptions that come across wrong to me. There are great points that are worth considering. I would suggest a mature reader who is already strong in their faith and discerning.

Singleness sometimes feels like a blessing but many time "single" feels like the badge that no one wants. As you grow up and the years continue to pass without that coveted badge of "married" questions of many kinds float through your mind. Am I good enough? Does God want me to be happy? What if I just settle?

But being single isn't a status symbol of one's worth. God is faithful in and out of marriage--He has plans for the not yet married just like He has plans for the married. Segal writes this book from the heart of not wanting people to flounder in the upset of "still being single" or to waste the time that God allows for our marital status to be single.

Don't waste your life, single or married.

In "Not Yet Married" Segal looks towards the questions we ask of ourselves and of God about what dating, marriage and our relationship with Him should look like across the board. In all, the pursuit is His love and affection. His fulfillment in our lives.

All good things for those walking in realm of the not yet married to hear and read (so if you are married this would still be a beneficial read to share with those you love that are single)

Might be good for young singles, but comes across as condescending to older (40 year old) established singles.