I don't go out to eat a lot when I'm in Arizona. But inexplicably, I've been to this Red Robin twice.
What I can say is that the service has been good both times. Both times were crowded, busy nights. The first, I was just there for dessert, but the place was slammed. They took care of the dessert and we were set. The shake I had? Well.....the service was good, anyways.
The second time I came in a large group. We were kinda picky, and the server was on top of it, taking care of every request. I got to see lots of dishes delivered, and I still think the winner here is the giant mud pie. Everything else is second place--maybe the fries are a thing because they're AYCE, but they don't touch the pie. The food is sound. Fine. It makes for a good place to take a big group and everyone can order stuff that they recognize.