Whatever else "Don Quixote" is, I never found it boring. Parts of it were very funny, others had wonderful similarities with Shakespeare, some bits were more serious: it's like a mini library in a single volume. Wonderful.
Overall, it has quite a shakespearean feel - more in the plotting and tales within tales (eg The Man Who was Recklessly Curious, stolen by Mozart for Cosi fan Tutte) than the language. In fact, the story of Cardenio is thought to be the basis for Shakespeare's lost play of the same name. Very funny - slapstick, toilet and more subtle humour, with lots of factual historical and chivalric detail as well, but it doesn't feel especially Spanish to me. Certainly long, but I don't understand why, supposedly, so few people manage to finish it. Some of DQ's delusions hurt only himself (tilting at windmills), but others lead to suffering for his "squire" Sancho Panza (tossed in a blanket) or reluctant beneficiaries of his salvation (the beaten servant, beaten even more once DQ departs) and bemuse people (mistaking inns for castles, sheep for enemy armies and ordinary women as princesses) and are used to justify theft (the golden "helmet"/bowl) and non-payment to inn-keepers. His resolute optimism in the face of severe pain and disaster is extraordinary. Meanwhile, Sancho wavers between credulity (wishfully thinking the promise of an island for him to rule will come true) and pragmatism. Reading it whilst my son and his friend who was staying (both aged ~10) repeatedly watched and quoted Monthy Python's Holy Grail was amusing!
Part II starts with Cervantes' response to the unknown writer of an unofficial sequel to part 1, though DQ, Sancho and others also critique it in early chapters. The following story presumes that part 1 is true, and shows how DQ's resulting fame affects his subsequent adventures. A very modern mix of "fact" and fiction. Some characters doubt his exploits, others pander to them, especially the duke and duchess who go to great lengths to treat him in knightly/chivalric manner, and provide new adventures (for their amusement, at the painful expense of DQ and Sancho). Sancho gets rather more scope for lengthy meanderings of jumbled and largely irrelevant proverbs. Less slapstick and more pontificating than part I - both DQ's advice to Sancho on how to govern his promised insula and when Sancho has intriguing disputes to resolve.