We were a hungry party of 5 looking for a place to have lunch in Old Montreal. After checking out menus of surrounding restaurants, we decided to choose this one mainly because they had a table available and the lunch choices were decent. The location is perfect, right in the square, close to the water.
I had a Caesar salad with grilled chicken. The salad was okay, I think they mixed the dressing with the lettuce ahead of time as the leaves were a little soggy. The croutons and chicken were good. Others in my party had burgers and sandwiches and were pretty happy with them.
La Grande Terrasse is a good place for lunch, you won't have a memorable experience, but your stomach will be full.