In my opinion, the Old Fashioned is one of the most overrated places in town. Always busy, forget going out with a group on a weekend night unless you want to wait an hour and a half.
Yes, the curds are good, but I've had better (try the Rigby). The best thing is the sauces that come with the curds (you have your choice of 4, all of which are pretty good). You can also get the sauces with the shoestring onions, which I probably prefer to the curds. The lazy susans are fun and different, and in my opinion the most exciting thing that this place has to offer.
I may be biased because I am not a meat eater, and therefore the Old Fashioned menu does not have much to offer, but I've talked to many other friends who agree that its reputation is overblown for what it is. If you want to have a casual lunch at a Wisco style pub for lunch during the week, the OF has decent salads and sandwiches. But with so many far better restaurants, gastropubs and bars in Madison, I can't imagine why you'd choose waiting in a cramped space at the OF just for the sake of the curds. Does not compute.