Mars is pretty much the definition of a greasy spoon. They serve all your basic breakfast foods along with burgers and other sandwiches. You can get a decent breakfast here for not a whole lot of money. The service is generally good. The food here is not outstanding at all, but it's not bad either.
The best thing about Mars is that it is open 24 hours on the weekend. Perfect for an after drinking meal. Unless it's 3 am though there are better places to get diner type food within walking distance. Still Mars serves a purpose and is good at what it does.