I'm probably a little biased because we originally went to CityPlace to eat at Legal Seafood and only ended up at Il Bellagio when we found out our original destination had closed down.
That being said, our experience at Il Bellagio was pretty decent. My risotto with shrimp was rich and creamy and my fiance's homemade Italian sausage was also very good. My grandfather ordered the linguine with clams and the number of canned clams in the sauce far outweighed the fresh clams that came with it, but it still had a lot of flavor.
Il Bellagio has standard Italian food. Nothing was stand out, but it certainly was good. I would eat here again if I happened to be at CityPlace for dinner - but I wouldn't go to CityPlace just to eat here.