I like that Mr. MacArthur doesn't "talk down" to his readers. If there's information that might not be well known, he tells it in a friendly manner. "Oh, and at that time in the Bible, things were like this: ..." And, he will connect the pieces of the Scriptures you might not have on your own.
I've really enjoyed reading both books of Twelves by John MacArthur. He gives a lot of scriptural references that makes these appropriate for teaching, study, and faith building. His implied doctrine is spot-on with the Bible. Both books are easy to read and hard to put down.