Both Maya Angelou, who bored the world at Obama's inauguration, and Rabbie Burns are truly dreadful poets. What they have in common is that they've been adopted as cultural figureheads in spite of, rather than because of, their artistic talents. And this is fine; cultural figureheads are good.
Poetry is perhaps the one area for which it is claimed that cultural origin justifies awful art. We don't excuse visual art in which the painter has no control of his medium, no concept of composition and has a woeful appreciation of form and scale on the basis that the painter was a Maori, and it's therefore brilliant. We don't excuse film makers who have no control of their camera, can't light a set, can't capture dialogue convincingly or edit footage coherently on the basis that the auteur was an Eskimo and therefore it's fine. But we do this all the time for poetry.
The best English poetry is of course written by the Irish. But this aside, you'll excuse me if this weekend I dip into A.E. Housman or Robert Graves as a prophylactic against accidentally hearing a rendition in a cod-Scots accent of some painful piece of dreadful doggerel.