I had the mac and cheese burger. The macaroni fell out of my cheese burger when I tried to eat it, so it was a bit messy. I think that the burgers at Red Robin have a distinct flavor that people might get tired of over time if they have too much of it. There might also be a slight charred/grill flavor to these burgers as well. I also had the bottomless fries with my meal. I think the fries can be hit or miss sometimes, but most of the time they are cooked right - where the fries are crispy on the outside and tender on the inside. I also like the variety of complimentary sauces that come with the fries. I like the ranch sauce the best, and then the ketchup.
We also ordered a bacon cheeseburger. Solidly good but nothing amazing. The bottomless fries are good if steak fries are your thing.