My family and I have had a long historic relationship with the Hofbräuhaus dating back to before 1918 in Munich.
The Hofbräuhaus here in Las Vegas is a rather good and authentic representation of the original Munich Hofbräuhaus, coming close in its atmosphere, food and music, although it is sometimes hard to find a quite table to talk when the live music is playing.
The only thing that might keep reminding you that you are not in Munich is that barely any of their service personnel speaks German not even to mention Bavarian.
I'd still recommend the Hofbräuhaus in Las Vegas to everyone who seeks authentic Bavarian Beer and Food as well as a touch of Bavarian "Gemütlichkeit"