I'm here at the Mandalay Bay attending a conference. I think the carpet here is a cut above most convention centers, probably because it's attached to a casino. It does look pretty much the same as everywhere else though.
In non-carpet related news, we got our room at THEhotel for the same price as everyone else who got theirs at Mandalay Bay. What's the difference? THEhotel is a nicer, casino-free sub-hotel that is pretty sweet. The upshot is that it's a 15 minute walk to my sessions though.