There are several works by Vonnegut worth a five star rating, but Breakfast of Champions is actually more like six stars, and in my opinion his best work, mainly because of three different reasons: 
 1. It features Vonnegut's most famous creation, the grumpy literary genius Kilgore Trout, in his most prominent appearance. 
 2. The metafictional aspects and the total destruction of the fourth wall. 
 3. Vonnegut's illustrations. Did you ever want to know what an asshole looks like?