Muslims claim that the 103rd surah is a matchless specimen. Maududi says: "A whole world of meaning was compressed into its brief words, which is too vast in content to be fully expressed even in a book. Imams have rightly said that if the people only considered this surah, it alone would suffice for guidance."
Qur'an 103:1 "I swear by time, most surely man is in loss, except those who believe, and do good, and enjoin on each to bear in fortitude the trials that befall." That's it - the whole thing, start to finish. While it was neither really good nor really bad, at least it was really short.