If a casino or hotel has one thing then everyone else has to have one too. There are few better examples of this than burger restaurants, and some are much better than others. If you find yourself at the south end of the strip, do yourself a favor and visit Burger Bar for your burger fix.
Aside from the recommended options, Burger Bar offers guests the ability to customize their burger any way they see fit. Bun choices, protein choices (even a salmon option), and toppings galore. The fries and onion rings are pretty amazing as well. I've been here a handful of times and have never been disappointed. The prices are reasonable in normal places, and downright bargain-priced for the Strip. I've dined here with a friend and we each got a burger, fries, and a beer for about $40 before tip.
This place often gets crowded, with wait times in the hour range. If you want to be seated fast, sit at the bar. The wait is usually zero and the bartenders are extremely friendly and helpful.