I live too far away to go here often, and that might be a good thing for my waistline. Sliders has probably the best burgers in Toronto, and maybe the best fries. They seemed to have cut some of the topping options on my most recent visit (didn't see any tzatziki there), but still a perfectly cooked patty every time.
The West Coast was great, poutine is amazing. I'd rate it up there with Nom Nom Nom's in terms of tastiness and authenticity.