I worked at University of Detroit School of Law from 1973-1996--here are my favorite lunch spots:

Cheap: REnaissance Deli--made sandwiches, subs and pizza. It was a dump, but it was near by, and they made decent sandwiches; Brothers Soul Food [[corner Jefferson & St. Antoine); Chin Tiki, they used to have a lunch buffet that was a couple of dollars; Ham Heaven,

Not so Cheap: Joe Muer's [[pretty much my absolute fav), Schweitzers, Ponchatrain Hotel--used to have a soup and salad bar.