The first time I experienced the Rock Bottom Brewery was in downtown Chicago. It was wonderful! I think I went back the next night because I had such a good experience. It's pretty much always packed around happy hour/dinner time because it's a great spot.
The Pittsburgh location doesn't quite compare. The actual layout, food, service, etc., is average. I ordered the bison burger last night and it was pretty good. But, it was a bit dry and it didn't seem like they put much effort into it. Honesty, when I received my food, it reminded me of being at a place like Applebee's of Chili's. They were out of Mac and cheese because they had had a busy night. I didn't mind that at all because I had tried the Mac and cheese before; you should give it a try if you haven't.
The waitress was great. She checked in often to make sure we were comfortable. The menu is large. You're sure to find something you want to try. But it's a brewery, so the options are mostly variations of bar foods. It's a cool place to go if you want to eat late and have a decent sized group with you.