A Poem For All Seasons

What makes a good poem? The beauty of the words? The easy flow of its lines? How deeply personal? Or should it be universal... singing to all of humanity? Should the poem be easily clutched by the mind's hand, or is it best to be recondite: hiding its meaning, secretive, needing a key to unlock what treasure there may be found? (For myself, I like the simple, both to read and write... for I have lived enough complicated.) Good poem, bad poem... what makes one catapult exuberantly into your soul while another is dragged down into the basement of the unconscious, there to be forgotten forever?