The MGM Grand is just a massive resort complex but I've had a good experience staying here. Front desk was very accommodating because about 4 of us had booked rooms and we wanted to be on the same floor. They not only had us on the same floor but right next to each other, for the most part. The rooms are pretty standard. We got 2 queen beds. Bathroom was decent, nothing special... but no complaints about the room either. Room had decent space.
Casino floor is pretty big. The MGM has a poker room so my friends like it. Across the street, NYNY does not and they would come to the MGM to play poker when we've stayed at NYNY...
Lots of places to eat here. From fine dining to casual... even your everyday fast food. The food court is pretty good but McDonald's is the only option after about 3am... Long lines. Pass. Tom Collicchio's 'Wichcraft makes good artisanal sandwiches. I had the bacon/fried egg on ciabatta bread. Good stuff. Only problem with 'Wichcraft is that they're closed by early evening so it's definitely a lunchtime/daytime type of sandwich place.
I've had to wait a long while for valet to bring our car on a busy day and I've also haven''t had to wait long at all when, in seeing the crowd of people waiting, I assumed I would. So the luck of the draw, i guess determines your wait time at valet.