There are many different Bible commentaries today, some are good, some are not so good. Some are written by trustworthy men of doctrinal integrity, some are written by men which lean more toward a liberal or critical approach. Some fall in between. As always, this is a matter in which we must exercise great discernment. We would not want to read a commentary written by an unreferenced source. Our selection should be based on some reliable knowledge or hearty recommendation of the author by men whom we know and trust. At the same time, it is so important to remember that no commentary will see eye to eye theologically with everything in which we believe. We will at times find ourselves disagreeing with the writer's interpretation of this or that passage or of other important issues. This should not at all though discourage us from consulting them. It is helpful when reading commentaries to always remember to, "chew up the meat and spit out the bones" or "take the good and leave the bad". Who is to say that we are always right anyway?
More so, commentaries are not all the same, different types of commentaries serve different purposes. Many are good in their respective areas of attention. I have chosen to divide them up into three groups of my choice to see the differences and purposes of use more clearly: Devotional, General, and Greek Exegetical: