It IS funny, the chapters are short and satisfying. The characters are real enough to start caring about them (something missing sometimes in slapstick), especially since the book wavers between genres, starts very funny and not very serious--though the jokes do highlight real life character foibles and which stay with you after the punch line is forgotten--and it gradually gets more serious and tragic. So, in this way its not very even, especially since he does one better than the other. Short and nice, and the occasional glimpses of profundity keep my Puritanical work ethic* from being aggravated. It's a nice book to use as a palette cleanser in between larger works.
*something I only have when it comes to literature and art, apparently