Solid 4.  I have been to three Maggiano's (2 in CA and now Vegas).  The one in Vegas is the best one.  This is my favorite place to eat Italian food.  The food is great.  They have large portions.  Service was quick and polite.  Always try to go to a Maggiano's on the off hours or make a reservation to avoid long waits.  My favorites are the chicken parm and garlic shrimp pasta.