Because the lines are usually pretty long,
there is no drive thru option, and half the time they don't even ask your name (or when they do its wrong), I dropped the fifth star.
On the plus side, there's LOTS of comfortable, shaded, clean outdoor seating (which makes it dog friendly). They recently did a remodel changing the flow and decor. It's right off the Summerlin parkway. The bathrooms are always clean. Friendly people patron this location.