What is your critical appreciation of "To Autumn" by John Keats?

"To Autumn" has a relatively intricate rhyme scheme of abab cdedccee in the first stanza and the 2nd and third stanzas are abab cdecdde. The ode describes autumn and in the second and third stanzas, the poet speaks directly to a personified autumn, a technique called apostrophe. It may be that the rhyme scheme changes a bit in the second stanza to accompany the shift from description to a direct address. 

In the first stanza, Keats emphasizes the sights and smells of early autumn. These lines are bursting with life and movement, the ripening process itself, literally coming to life. Autumn is compared to a woman in union with a male sun (perhaps a pun on son), their interaction a kind of procreation, making life all around them. During early autumn, farmers are still collecting the harvest, the fruits of labor and the result of life which was planted in the spring. The stanza ends with those fruits personified as well, thinking their "warm days will never cease." 

In the second stanza, the poet talks directly to autumn and imagines her (autumn) patiently witnessing the end of ripening and the completion of the harvest. 

In the final stanza, the poet laments the absence of spring's sounds, but tells autumn that her music is beautiful too. This stanza emphasizes the sounds of late autumn which foretell the coming winter. The swallows gather for their migration. Their twittering is like a church bell marking the close of the day. The stanzas are also arranged within the structure of a day: morning midday and evening. And they are arranged in the structure of a life: conception/birth, growth and death. 

Winter, the end of autumn, is symbolic of death. Despite the morbid sense of this symbolism, the poet accepts the end as it is a natural part of life. In many of Keats' poems, he illustrates how joy and sadness exist together. Being aware of death, one's own mortality, is key to appreciating life. Being conscious of the fact that life is fleeting (that winter/death will come) should lead one to not take it for granted. 

Why do you like the poem "To Autumn" by John Keats?

You are being asked to analyze John Keats poem “To Autumn” in order to decide what you enjoy about reading it. This question requires you to form an opinion based on the form, meaning, sound, or feelings evoked by the poem.

One reason to enjoy the poem is its topic; the season of autumn. For some people the passage of the seasons is one of life’s pleasures, and Keats describes autumn with vivid imagery. In addition, he compares it to spring by describing the differences between the two seasons. He tells the reader to let go of spring and let the sights, smells, and changes in nature advance. And, he explains how summer is coming to an end.

And still more, later flowers for the bees,
Until they think warm days will never cease,
 For summer has o’er-brimm’d their clammy cells.

Yeats uses the poem to focus on the delights and abundance as autumn brings the fruitful harvest to fruition. This poem does not lament the passing of the seasons, instead it explains how this transition is fulfilling.

Where are the songs of Spring? Ay, where are they?
 Think not of them, thou hast thy music too,--

Another reason to enjoy the poem are the rhyming schemes and poetic techniques Keats uses in the three stanza piece. The poem “To Autumn” contains a number of different rhyming schemes with both internal and end rhymes. Perhaps this is an attribute which you enjoy about it. The rhyming schemes add interest and fluidity as one reads the poem. The poem contains examples of alliteration, and assonance, which add to the reader’s enjoyment, and provide explicit imagery. An example of alliteration is “winnowing wind,” while the words “reap’d and asleep” in the second stanza provide internal rhyme. At the end of the last stanza, the poet appeals to the reader with more auditory imagery by describing the sounds of autumn.

And full-grown lambs loud bleat from hilly bourn;
Hedge-crickets sing; and now with treble soft
The redbreast whistles from a garden-croft,
And gathering swallows twitter in the skies.

Each person will find their own reason to enjoy the poem, and you will use text evidence to explain where your gratification comes from.