Take advantage of pre-check in services in the airport and hotel Dollar car rental services at the hotel.
You would be very surprised that a hotel this size still can crank out great service and quality food. My stay was between 5/10-5/14 in a standard room that was ajoined with another couple. Although, my friends room had a night table that's has seen better days and remote control that was dirty and dust on the ceiling, after letting the front desk know, they had a house keeping manager inspected both of our rooms and cleaned them without interuption on our first night stay.
This hotel has over 4000 rooms, and the lobby is always busy, but you can always find a gaming table or machine.
The Grand Buffet is well worth the money. Please make sure you tip the wait staff.
Self parking and valet are both free. Again, they don't make you feel like they expect a tip but are pleased when they are tipped.
Overall, they have my business locked in. MGM Grand is part of a chain of casinos so if this place does not fit your budget, try the Luxor. Good for the money, but just ok on service.
MGM Grand as exceptionally good service and great quality control for the most part.