The structure is good, the three quatrains offering distinct yet equivalent figures for the time of life of the unsuccessful and to-be-pitied lover. But the first quatrain is the boldest, and the effect of the whole is slightly anti-climactic. Within this quatrain I think I detect a thing which often characterizes Shakespeare's work within the metaphysical style: he is unwilling to renounce the benefit of his earlier style, which consisted in the breadth of the associations; that is, he will not quite risk the power of a single figure but compounds the figures. I refer to the two images about the boughs. It is one thing to have the boughs shaking against the cold, and in that capacity they carry very well the fact of the old rejected lover; it is another thing to represent them as ruined choirs where the birds no longer sing. The latter is a just representation of the lover too, and indeed a subtler and richer one, but the two images cannot, in logical rigor, co-exist. Therefore I deprecate shake against the cold. And I believe everybody will deprecate sweet. This term is not an objective image at all, but a term to be located at the subjective pole of the experience; it expects to satisfy a feeling by naming it (this is, by just having it) and is a pure sentimentalism.
(John Crowe Ransom, Shakespeare a