We ate here twice, once for lunch and the following day we came back with friends for dinner.
Lunch was outstanding, good service and great food. I had the Wednesday daily special and it was delicious. My wife had the chicken piccata and loved it enough to order it again the next night.
Dinner on Thursday night managed to knock off two starts. We were seated quickly enough, the waiter came to take our drink orders and disappeared for a while. The food finally arrived after a lengthy wait. The waiter dropped it and ran. I asked for another glass of wine that never arrived. In fact we never saw our waiter again for over 45 minutes. He never came back to check how the food was or to see if we needed anything else. Never. Finally we asked to see the manager who arrived 20 minutes later and listened to our complaints but really didn't seem interested in doing anything about it. They offered to comp our drinks but the waiter never came back to take any drink orders (other than my glass of wine which never arrived) so that was a no go.
So the five of us left rather irritated with the poor service, this is the Bellagio after all! On the upside the food we were served was outstanding, it just takes a while to be served and order your drinks early, they may never come.