Sadly this place is just a tourist trap with mediocre food. If you're looking to try a good poutine, there are many amazing places in Montreal but unfortunately this isn't one of them. We heard bad reviews but had to give this place a chance since it's always packed.
The two different poutines we tried were not good - the fries were similar to frozen store bought McCain fries, definitely not freshly cut and made in house from fresh potatoes. We also ordered mozzarella sticks, which turned out to be filled with Cheese Whiz (gooey orange synthetic stuff) instead of mozzarella.
If you want a real good greasy poutine and meal, you're better off going to a diner like Belle Pro or Lafleur!