Probably the best burger joint in Toronto - the Craft Spicy is a personal favourite and their rings and fries are very, very tasty as well. Their organic patty is also decent and they have fresh toppings with a good selection of cheeses.
But it's not without flaws; it's a little inconsistent depending on when you go and the service is unjustifiably long. The burgers are made fresh, but it is a good 5 to 10 min wait. For any burger enthusiast, you absolutely have to try it and it's the next best burger you can have (next to homemade).
PS - for fans of Craft Burger, if you are going to NYC you definitely need to check out Stand Burger. The porcini mushroom burger is to die for.