For me it is about service, and the Bellagio does not disappoint.
From the moment we first walked in. We had been on a long flight and were visibly frustrated with a group of (French Canadians, sorry for the call out but it is always you guys...what gives?) taking forEVER in the check-in line...a Maitre d' or floating bellman or whatever he was came over and whisked us over to the exclusive guest line and got us in right away, nice touch.
Every single employee we passed throughout our stay were friendly and responsive. Spa employees were apparently fantastic, so says the girlfriend.
Kinda rambling here but I like that the Casino slot machines seem to be toned down about 20 notches less than the other Casinos.
All in All, just top notch.