Humorous in its style of describing Quixote's ludicrous behaviour using his own exaggerated sense of seriousness and significance, while at the same time alluding to the sad reality.
Interesting as an early (the earliest ?) example of a book portraying the mental state of the protagonist.
Disappointing overall. I did not feel the narrative was hinting at more profound truths, at deeper motivations, or evoked strong identification with the characters - as I did, for instance, in Tristram Shandy.
Perhaps I needed to read it in Spanish ?