I don't know what other reviewers are complaining about with this place. Parking is valet-only here, so suck it up and thank the valet guy with a tip. Or if you're from out of town, take a taxi from your hotel. Both times I have been here the service has been excellent. Saw Pia Zadora on a Saturday night. Pia's husband went out of his way to ensure we had seats at the bar, bringing in additional seats to accommodate us. Bartenders are great and Pia is fabulous.
A couple weeks later I took some visiting guests for dinner late on a Sunday night (last night). I called ahead to check availability and when we arrived we were seated immediately and the service was excellent again. The waiter was great. We all chose different entrees and everything was excellent. Previously I have heard/read complaints that Piero's food is Olive Garden quality but that is simply not the case. Piero's food is excellent and exactly what one would expect from a high end Italian restaurant. I had the Osso Bucco and it was to die for. My friends were thrilled with their meals as well, and said they will make Piero's a regular part of their Vegas trips from now on.
I suspect those who complain about Piero's are either cheap or just not used to real high end dining. FYI, most of the restaurants on the strip aren't exactly true high end. They may offer good food and "fancy" environs but they are still just another overpriced cattle call to appeal to the masses who want to see and be seen as "living it up". Piero's is exceptional.
I will most definitely be back.