A website recently put Big Smoke Burger in its Top 10 for Toronto. It offers a good burger, but Top 10 may be a bit of a stretch.
The burger I had was satsifying and properly cooked, and the best part was probably the prize - just $11 for a cheeseburger, fries and a drink - a lot more affordable than other joints.
If you go for lunch on a weekday, try to get there right at noon or a bit before because seats disappear quickly. There's seating for about 15 people inside.