lunch near Queens University, Charlotte
Try Mueller's: http://www.muellersgrill.com/
Its not exactly cheap for a sandwich shop, and its no longer a secret but its worth going to if you like a good burger or sandwich.
Depending on how close to Queens you need, you could also try the Montford Dr. route:
Luisa's for pizza.
Roasting Company for chicken / Caribbean style food (excellent veggie options
)Ole Smokehouse for bbq (not the best for traditional NC 'cue but good for lunch)
Park Rd. Shopping Center has:
Sir Edmund Halley's
Situl Indian (recently fantastic, they got over their several year slump)
In between the two is Park Towne Village, which has 3 bar/restaurants:
Duckworths (excellent for beer lovers)
Hef's (nice and laid-back)
Tavern on Park (little nicer but better for drinks than food)