One of my fave restaurants en el mundo is La Frontera Grill in Chicago, so when I ate dinner @ MASA, I came in bearing too many expecations and was underwhelmed.
Finally made it back for lunch (2x last week, actually) and really enjoyed it. Especially loved the Posole Verde. And they are the only place in Minnesota that carries Del Maguey Mezcals, which to me are worth the trip and the cost.
Masa in Minneapolis - Pretty Good IMO.
I have enjoyed the ribeye with ancho-chipotle butter (though the manner in which the grilled green onions are served tends to get them stuck in your teeth). the pork shoulder entree has also been very good. The ceviche is not the best I've had in MPLS, but it has been fresh.
On the down side, the 2 fish dishes we've had have been let-downs. The striped bass enchiladas were bland and the tortilla too heavy to let out the flavor of a fish that delicate and the shrimp entree was overcooked.
And say what you will about the D'Amico's, their restaurants have consistantly excellent service.
My best positive however is the happy hour. Give it a shot!