Question (before editing) was, more or less, is John MacArthur more of an expositional preacher or dispensational preacher.
As Bruce noted, the two are not necessarily mutually exclusive. An expository preacher is one who preaches on passages of the Bible, expositing what the text means using the tools of exegesis and theology. One of the things you learn, however, when you study exegesis is that theology informs exegesis. Considering a noun in the genitive case, for instance, one must determine the type of genitive it is and that can have some interesting theological variations within a passage. Context certainly helps but one's overarching systematic theology is bound to enter into to any exposition of the text. One obviously wants to check their overalll hermeneutic with Scripture but exegesis and systematics inevitably interact during the process of preparing an expository sermon.
That's a long way of saying that it's not that exposition fails to occur but the systematic "ground" that informs the exposition. I can listen to MacArthur with great profit at times but, at others, his hermeneutical differences take texts in directions I fundamentally disagree with.