I've been going to Viva Mercado's for close to 15 years. I don't do many reviews on Yelp, but feel like I owe Bobby one after being there a hundred times, and always having a great experience.
This is the best Mexican food in Vegas. I really can't say I've had better Mexican food anywhere. Do yourself a favor and go....even if it is a drive. We live in Centennial hills and make the drive any time we want Mexican food. There is a movie theater in the same shopping center so a great one stop for dinner and a movie. The service is always great. Anything with shredded beef is amazing and they have the best nachos on the planet. I'm a creature of habit and mostly get the same thing, but everyone we take there loves it...regardless of what they order.
The waiters and staff are always very nice and quick. Several have been there for a very long time. Our cups are rarely empty, as anyone going by will fill it up if they see it empty. They usually bring out a small dessert for free - which is always a nice treat for the kids.
My only complaint is that there isn't a location by us, or we would go more.