Throw light on the subjective elements in Shakespearen sonnets

This is a pretty involved question for this short-answer forum. Subjective elements really means elements that are based on opinion. When looking at Shakespearean Sonnets ones own personal feelings and ideas come into play. In sonnet 18, for example, the speaker says:

Shall I compare thee to a summer's day? 


Thou art more lovely and more temperate...

We can either take the speaker at his word or we can be critical. Do you think his lover is as beautiful as a summer's day. Does the sonnet give you that feeling? This is where your subjective elements come into play.