This happened a few months ago, but didn't yelp then lol.
We went in around noon on a weekday. In kind of a hurry because my wife only had an hour on her lunch break. We were seated. Hardly anyone in the restaurant. We sat and weighted for 15 minutes... literally 15 minutes. No one ever came to our table, so we got up and left. My wife said something to the manager as we were leaving. She tried to give us a coupon for a free meal, we didn't take it though.
Came back 1 time since then. Similar situation. Our waiter came and took our drinks, didn't come back with them for 10 or 15 minutes. We sat and watched him chatting with the cooks just messing around.
A shame cause I love Red Robins food, and this location used to be good years ago, but it sucks now. Terrible customer service.