Not being an older person (over 60), I didn't think I would find all the exhibits on the 50's too exciting. I was hoping for a more modern peek into the gangster lifestyle. Luckily, there was a decent display on my era's gangster - John Gotti. They had his jacket and info on his life and death. A cool section was right at the end also where a giant lounge was created to watch clips of the great mafia movies of all time. I also liked the part where normal guys talked about accidently running into mob figures. Also, worth seeing in my mind was the "Mob's Greatest Hits" section which contained graphic photos of all the ways these guys bit the dust and stories of things I grew up with like "where is Hoffa" and all the rackets these mafiosa's were corrupting.
The entire top floor can basically be skipped unless you want a history of the building of the Hoover dam and how Las Vegas was settled. The courtroom was used to show films of the hearings held in that same room. but there must have been a lack of things to do back in 1950 because nothing seemed to get accomplished in the hearings. Make sure you get a photo of you in the lineup or at the machine gun. Interactive exhibits needed some work.
It's worth the $10 locals price and does give you some insight into the mob activities, but the fact that Gotti and others besides Siegel and Lansky are touched upon, makes the difference. If you go when it's crowded, it won't be fun. Rooms are small and a tight squeeze if mobbed by tourists.