I'm here every year for the AAPEX show. My company has a booth and stand so I get to deal with the wonderful world of union employees - Vegas style! To be honest, I have never had ONE bad experience here. Is it overpriced? Yes. But the service and the performance (ability to make things happen) is always on point.
The one really big complaint I've always had, are the bathrooms. Really. They are basically non existent. This last time I stood in line with a bunch of men to use the one open loo. It was not a pleasant experience.
A convention center of this size has no way of being clean. I see a show from set up to tear down, and I'm always amazed that no one get's killed or injured. The place is huge and there is only so much people can do.
The transportation is easy in and out which I love - and being connected to Casinos doesn't hurt!