I was pleasantly surprised by a trip to Maggiano's a little over a month ago during a visit to Las Vegas. I normally avoid chains, but this one is worth visiting again.
The appetizers were all very good (we went during happy hour). The main courses were huge and moderately priced. The service was very fast without bring rushed and our waitress was friendly.
The location is convenient on the front of the Fashion Show Mall. Easy access from The Wynn, which is where I was staying. Plenty of on-site parking as the mall has every parking option under the sun.