1. I have not had the taco bowl at the Trump Tower Grill, a restaurant situated on the ground floor of Trump Tower. But in my experience (credentials: lived in California for seven years; wife makes it frequently, passed down from family), the best Mexican food comes from places where the focus is on Mexican food, not places where you could get a taco bowl or you could also get the lobster ravs or the "Ivanka's salad."
2. What's more, New York City is great at everything, but notoriously crappy at Mexican food. Even the good Mexican food in New York City isn't that good. (I do have some recommendations, though, so feel free to email.)