Old Chicago is a Chambana favorite of my friends and I. We usually end up going on Tuesdays because pizza is priced half off, and we are poor college students. Overall, the food is pretty good and the atmosphere is nice when it isn't completely crowded. It is a chain restaurant, so don't expect unique gourmet cooking. The 'Chicago-style' pizza is more like a standard thick crust pizza as opposed to REAL Chicago-style pizza. Try Papa Del's or Amano's if you're looking for more legit Chicago-style pizza.
All that aside, Old Chicago is a nice place to go with friends and/or family. I have usually had good service, and there is a full bar if you want a drink or two. The prices are a little steep if you don't go on Tuesdays though.
PROS: Cheap on Tuesdays, decent food, pretty good service, family-friendly atmosphere
CONS: Pricey on most days, NOT real Chicago-style pizza, loud when restaurant is crowded