I'm not sure I find anything particularly intriguing about it. I suppose the reason I like it is precisely that—there is nothing intriguing about it! Instead, we have a rare instance of a comprehensive systematic theology written by an orthodox, confessional, Presbyterian churchman, whose only interest, as he says in his own preface, is "to preserve the orthodoxy of the Church, and to advance the propagation of the full counsel of God." He doesn't attempt to do anything new other than synthesize for a new generation this counsel. That makes his work great to me.
(As an aside, it also helps that he is a Southern Presbyterian who studied under Dutch masters both living and dead. He draws deeply from Bavinck. And, he gets points with me for being Presuppositional.)