I'm not sure why you think people don't book there---when I'm looking for close-in reservations at Epcot, Tutto seems to be the next one to go after Le Cellier, Garden Grill, and Coral Reef.
But, I personally have never bothered because (a) I have great Italian places here at home that are (b) a *lot* less expensive. Tutto seems to be ridiculously overpriced to me. For example, for $12, that had better be the best cannoli on the planet. Perhaps if I were on the dining plan, I'd feel differently.