3.5. Located in the shops that connect Mandalay Bay and Luxor, Slice of Vegas has some good points:
1. They sell by the slice as well
2. They have a Happy Hour that runs during the work week.
Other than that, Slice of Vegas would probably be my dinner pick based off of sheer convenience for when I'm being utterly lazy and don't want to walk too far to go anywhere. It really wouldn't be my first, second, or third pick for pizza on the Strip but gets the job done when you are in need. It's not bad pizza, just a greasy knife-and-fork pizza that doesn't leave any lasting impressions of pizza happiness in your mind. (Pin Up Pizza does for me!)
Kudos to these guys for a Yelp discount. As always, expect Strip pricing for anything here, so pricing seems exorbitant for the pizza quality that you get here. Stop by if you are on your death bed from hunger and need a pick-me-up before the next activity on your to-do list.