I can still remember the old student union, which was one story and had more character. The new student union (built with fees myself and others had been paying for many years before it was built) has better amenities and a second floor, but resembles a mall foodcourt.
I wish they had a better selection of places to eat. Do we really need a Taco Bell, Subway and a Panda Express when they have locations about a mile from UNLV? The Jamba Juice is the only place I eat at there; I tend to go to local businesses across the Maryland if I want to eat.
The meeting rooms are quite nice. I've been there for various organization meetings and workshops, and they have plenty of outlets and equipment you can request. My only complaint is that occasionally when you try to book a room as a campus service/organization/etc you'll be told there are none because they also book them for money to non-campus entities.
I haven't used the computer lab at all, so I won't rate that. I did see Zombieland in the theater a few years ago, and it was excellent (both the theater and the movie).