I had a perfectly enjoyable time at Sensi. Much of it was the party I was with, but the restaurant did nothing to upset balance. Open kitchen concept sort of - glass partition. I ordered three small plates: roast duck dim sum taco things (wowser), Brussels sprouts (very good), crispy shrimp (the low point of the meal - seemed a little tough). I have no real complaints.
We didn't pick Sensi because it was in the Bellagio, but I'm glad it is - spectacular people watching. The water sculptures walking into Sensi are very cool as well.
Great wine selection.