I have read the New Jedi Order books a few times. For me, the best ones are Vector Prime, Dark Tide, Edge of Victory, Rebel Stand, Traitor, and Destiny's Way. The Unifying Force has some great moments but goes on for far too long (which I guess I could say about Star by Star or the whole NJO series, too). Traitor is a real love-it-or-hate-it book and is kind of the outlier of the series.
My advice for almost any of the Star Wars books and series is to read a chapter or two. If you are liking it, then keep going. Otherwise, find something else that you like more and read that. There is enough Star Wars material that you will not run out.