I have to agree with Ruben on Burgers: Royal Meat is amazingly good!
Pizza: Mike's (In Montreal) and Antica Pizza in Niagra (thin crust pizza but the old fashion style, absolutely best tasting pizza).
Side note....talk about Pizza/Burgers and no Poutine?!?!?!
Poutine: Roi de la Patate and La Belle Province
(both in Montreal :P)
Ribs: Bar-B Barn in Quebec!
And just because I love it so much, Chiken: ST-Hubert!! (or it's equivalent here Queensway Rotissery.
Can you tell I like to eat good food? LOL