I think this is my new favorite place to eat in Vegas. Definitely the best place to eat in Bellagio. The seafood is top quality and the service at the bar was on par with the food. Like any restaurant there will be things you will like and not like. I have a feeling that there will be few things at Yellow Tail that I would not like. The view of the dancing fountain out front is the "cherry on top" of high class ambience.
Don't expect large portions. The food served here is carefully and delicately crafted. Take your time and enjoy every bite and you will be satisfied. If you are looking to hobble out of yellowtail with your belt loosened, then you have the wrong idea. While the prices were high (all Bellagio restaurants are high priced) this was one of the few places that earned their high price. Some have said that this is overrated, my experience did not disappoint and I look forward to going back every time I come to Vegas.