I will go with Kevin C. on the service at Isla and say it was great until the last 20 minutes (waiting on our bill). Being from Southern California, both my husband and I have a high opinion on what Mexican food should be and, fortunately, what Mexican-fusion should be. Isla's food was good and the chips and salsa were close to the best I've had, but the prices were sort of expensive for what you got. Who has ever heard of a single cheese enchilada being more expensive than three beef tacos - it's cheese for goodness sake?! That being said, my carne asada tacos were delicious, as were the rice and beans it came with. My husband really enjoyed his carne asada burrito, saying it was better than his favorite back home.
To me this place reminds me of a higher-priced El Torito Grill, but still a worthy restaurant if you are looking for some Mexican Food in Vegas. We were pleasantly surprised, although I wouldn't say it is a "must eat".