Burgers at The Venetian

I’ll be staying at the Venetian the end of this month. This trip I’ll be dining more casually than usual, but it occurs to me that I’ve never had a burger at any of the joints on the property. When I have a burger at home it’s usually from a local restaurant, and I avoid chains. 

The Venetian seems to have a number of options for burgers, none of which I’ve sampled (and most of which I’ve never heard of.) Care to rank these options from best to worst? (Not interested in off-property options this trip — maybe next time.)

Black Tap
Fatburger
Grand Luxe Cafe
PrimeBurger
Johnny Rockets
...any I missed?

Bonus points: does any restaurant on the property do a proper patty melt (i.e., with rye bread)?