My girlfriend and I went to La Banquise because they offer vegetarian poutine, which are very hard to find in Montreal (believe it or not).
This rating is solely based on the burgers since I don't really like poutines.
I have tried both of their specialties, "Banquise Burger" and "Costaud Burger", but don't set your expectations too high, the patties are unseasoned (or underseasoned at best) and the overall flavor you get comes from all the toppings.
Take notice that, when ordered in a trio, the hamburgers come with a huge amount of french fries that can easily feed two people.
Regarding the vegetarian poutine, my girlfriend said it was ok, but nothing extraordinary either.