Mars is the greasiest spoon around. It's cute in how authentic of a diner it is, it is dreary in how authentic it is, it is unhealthy, it is quiet, it is conveniently located, and on the weekends it is 24 hours.
I'll admit that the one time I ate there I wasn't exactly in a proper state of mind, but after dancing at the Boat in Kensington for a few hours, it was the perfect fix for my drunken evening. Whatever I ordered was vegetarian and delicious. I probably got grilled cheese and a milkshake.
I know someone who swears by their French toast. I suppose it's better than swearing on your mother's grave, eh?
PS Did you know that there is a Mars uptown? 2363 Yonge St at Eglinton. It's much bigger.