What I like most about Erin's Pub is the atmosphere. The restaurant is super cozy, complete with a fireplace perfect for frosty Wisconsin winter evening, but they also have a great patio in the summer. The warm wood interior and Irish themed decorations just make it a place you want to be.
They do offer quite a bit of traditional Irish fare and have a nice, long drink menu. Actual food is just ok, but the ambiance is the real draw. The restaurant is spacious, too. This would be a good place to take out of town relatives and friends. Also one of the nicer restaurants (in appearance) near Sun Prairie. I would totally go back.