I want to give this place a better review since it's at my favorite spot on the trip - The Cosmopolitan.  The thing is...the burger was not very good.  My wife and I split the Nom Nom Burger (Kobe beef, potato chips, thousand island dressing) thinking it would be something we couldn't find somewhere else.  The beef patty was overcooked and did not seem to be seasoned.  The potato chips were a nice touch and appeared to be made in house.  The hamburger was simply lacking flavor.  I'll say that we enjoyed the french fries that came with the hamburger (and all hamburgers at Holsteins.)  The beer selection was admirable and allowed me to an IPA that I've not had before.  Too bad for you that I can't remember the name.  Overall, I think that I'd go back because I got the feeling that they could do better.  Casual, relatively affordable and average from most angles.  A safe bet if you are already in The Cosmopolitan, but not worth a special trip.