I'm DEFINITELY a fan! Shake Shack ALWAYS wins the battle of the first meal in Vegas.
It's even BETTER when you're holding a MLife Platinum card so you can go up to the express line. There are two lines - the regular line is the winding one, and the express line is right up against the menu. So as long as you know what you're ordering, just walk right up and flash your HIGHER-TIER MLife membership card to get served next.
My go-to is the Shack Stack - "Cheeseburger and crisp-fried portobello mushroom filled with melted muenster and cheddar cheese topped with lettuce, tomato, ShackSauce". Seriously, if you love mushrooms as much as I do - you NEED to treat yoself to this burger. But be careful, the muenster and cheddar cheese WILL squeeze out the other side of your burger so it's best to eat it from the little baggy to catch the cheese. Or eat it over some fries for extra cheese.
The SmokeShack is the second best, IMO, with the all-natural applewood smoked bacon and chopped cherry peppers. The peppers do give it the tiniest bit of heat and crispy bacon is ALWAYS amazing.
You can also order the burgers (sans Shack Stack and Shroom Burger) as single or double. They'll also ask whether you want onions and pickles. You can also remove the lettuce and tomatoes if you want to make it "your own" burger or whatever.
I guess they also have fries and desserts on their menu, but honestly, I'd opt to get TWO burgers (the Shack Stack and SmokeShack) because the burgers are definitely smaller than other burgers. Oh! But their Shack-made Lemonade is the BOMB too! My mouth is watering as I'm writing this review and all I want to do is fly back to Vegas for these burgers.
One last thing - the place can get PACKED! Seats will get taken quickly. Literally everyone is gathered in the center of the restaurant waiting for their order OR getting their drink from the machines. Just wish there was more organization to the madness...