What is the "best" and the "worst" in the poem "The Second Coming"?

This Yeats poem does everything a poem is meant to do. As “concentrated word magic” the poem speaks to a deep-felt anxiety in all Christians, that Christ’s appearance on Earth has somehow failed to redeem us all, and the chaos of the present time (referring not only to the political/military complications in Ireland in Yeats’ time, but in all the post-Nativity history of Man) signaled a need for another miracle, another sign of a right direction for humanity. "Surely some revelation is at hand; Surely the Second Coming is at hand." The best of the poem is its clarity of metaphor: the reference, for example, to the “ever-widening gyre” to illustrate how we are drifting farther and farther from the “center” of Christian dogma – the “falconer” (Jesus). If there is any weakness in this poem, it is the absence of an identifiable narrative voice, the singular narrator (most often expressed in the pronoun “I”). What this does is universalize the chaos: “And everywhere/ The ceremony of innocence is drowned.”