Old Chicago is about what you'd expect  from a chain serving by that name - a pretty basic menu, with a Chicago slant.  The food rates a solid 3 stars - not outstanding, but certainly not bad, and good enough for me to go back.  I threw in a 4th star because we've had consistently great service there.  We've had one waitress twice who is genuinely nice, clearly doesn't hate her job, and is on top of her game service-wise.  That stuff goes a LONG ways with Brak.  For a casual meal and perhaps a couple of belts, I rank Old Chicago comfortably ahead of such yawners as TGI Fridays (which has declined a TON in recent years IMHO) and others like Chilis and (gasp) Applebee's.  Give it a try, I think you'll like it.