I'm giving the Rosemont a 3 for a few reasons.
As far as the food goes, I'd give it a 5 - the fries,fries,fries appetizer was incredibly tasty & it came with 3 different dipping sauces. The crinkle fries tasted delicious. We also ordered the spicy buffalo chicken dip, which was good - nothing crazy.
As far as the service goes, I'd give it a 1. We went at about 3:00 on a Saturday afternoon - it wasn't very busy at all. We could visibly see open tables, but the hostess took over 10 minutes to seat 3 groups of people. It was the most bizarre experience I've ever experienced...it seemed like the hostess was on another planet when you'd ask her a question. Once seated we sat for 10 minutes without a server coming to greet us. I had to go back to the hostess and ask her who our server was.
The atmosphere was OKAY. It looks very clubby. For the evening and nighttime, I think the dim lighting and red lights would be fine, but for 3:00pm in the afternoon, it was so dark and so emo feeling. The atmosphere doesn't quite match the fun/soda shop menu.
I'd love to see something make it in this location, and hope that Rosemont can step up their service and atmosphere to match their fun menu!