My family and I checked out Hash House a Go Go after seeing it on Man v. Food. The portions were massive, but that was about it.
The food was a little too rich for my tastes and because the portions are so big, it began to get a little monotonous. I'd recommend the fried chicken eggs Benedict, but the French toast is too thick and dry. There aren't enough fruits to balance it out.
If you're looking for brunch in Las Vegas you can do better than Hash House I'm sorry to say. Spend your time waiting somewhere else as the line at Hash House is quite long as well.