"Collected Poems" is a compilation of all poems written in the past fifty (something) years by the poet.
The poems are wildly different in their subject and execution. This is to be expected as the poet also is "wildly" different than when he started. So if one poem doesn't strike you the reader perhaps another one will.
And perhaps you will think that some poems are better than others.
The poet understands and only wishes that you will find one that you like.
