The food was pretty good, but the service was average. Additionally, I feel we got screwed when ordering one of the vegetarian specials...
My girlfriend order a vegetarian pasta which was one of the specials. Given that the special was not listed on the menu, we were not aware of the price but assumed it fell into the range of $23-$35 along with the majority of the dishes on the menu. We were surprised when we received the bill to find our that the vegetarian dish was $55! I had the lobster gnocchi (which was delicious) for $32. How is a vegetarian pasta more than a dish that includes lobster? The vegetarian dish is even more expensive than their filet.
Again, the food was good but the service was average. Additionally, we felt a little screwed by the relatively high cost of a vegetarian dish.
Given that the Las Vegas strip has MANY good restaurant options, I would not recommend Fiamma.