Definitely nothing special about this place. It's a chain restaurant, and you can definitely tell by the lack of quality and good management.
I've actually been to Les Trois Brasseurs more times than I can count, but that says nothing about my lack of affection for the establishment. I've gone so many times because I live only a few blocks from their locations on St. Catherine and it's one of the closest places to go watch a hockey game and grab a drink.
The food is lackluster pub food. I usually get a chicken and pesto flamm since it's one of the healthiest items on the menu. Portion sizes are huge for Quebec standards, but not anything special. They do brew their own beer, which I can appreciate, but Quebec has far better beers to offer at other local brewpubs.
My main issue with Les Trois Brasseurs is that they have consistently terrible service. On several visits we have waited over an hour for our food. More than once we have ordered a beer and had it not come until well after our food was served. Forgetting our order, not bringing something we asked for, or bringing us the wrong order is a usual occurrence.
My advice, go to Les Trois Brasseurs if you're out of other options. Otherwise, there are far better places to go to in the city.