I can't figure out why "The Night Belongs to Mona" is so unpopular. It's one of my favorite tracks on the album. That said, my taste in Fagen's music is probably different than the others who have posted. I tend to favor more melodic vocal lines, dense harmonies, and interesting, progressing chord changes. Some of the songs that I think exhibit this well are:
Deacon Blues
The Night Belongs to Mona
The Great Pagoda of Funn
On the Dunes
Snowbound
Maxine
IGY
And others. I do love the rippin' guitar and other elements, but I favor the jazzier (is that even a word?) stuff more. For those of you who disliked "The Night Belongs to Mona", what exactly makes you dislike it?