The building is nice and accessible. There is good parking. It's clean and safe and you could take kids here without concern.
I think in a different setting I would have given this a higher rating. The issue was just that I found it a little boring. Despite being a historian, I was in Vegas for the same reasons as most people - we were relaxing and having a good time. The place was just a little dull. There was a lot of reading involved and several movies. It wasn't very interactive.
There were some really displays - the St. Valentine's wall, Capone's gun, and some weaponry really stuck out. The place was just begging for some interactive displays and photo op situations like the wax museum, etc.