@George,
Big Umberto Eco fan here.
Of his novels, I rate:
The Name of the Rose: 10
Baudolino: 10
The Island of the Day Before: 8
Foucault's Pendulum: 7 (it's the hardest one to read, but worth it).
I don't know if his "Minimal Diaries" are translated into English. They're certainly worth a lot of laughs and a lot of afterthoughts. "La Bustina di Minerva" and his essays on literature are very good. His book "how to write a thesis" is better than most teachers.
... and then there are his famous writing on philosophy and mass communication.
...
On 1976 I went to a few of his classes at the University of Bologna, fascinating... but I didn't do the readings and found myself often lost, as other teachers used to pass by and engage with Eco in bizantine (to me) discussions about Plato or the hidden meaning in the Middle Ages idea that the blood of a male goat could cut diamonds.