The UNLV teams had some weaknesses that could be exploited as Duke did the following year in the Final Four when they beat the same UNLV team.
They were not a great outside shooting team, they didn't have a dominant post player, they were not great in the half court game. However, they did have great pressure defense and if you couldn't handle that, you were going to be blown out, because it didn't let up.
The very next year, the almost identical Duke and UNLV teams met in the Final Four and Duke controlled the pace of the game and beat the Running Rebels. I think the UCLA teams of the 70s and the 75-76 Indiana teams could have done that also.