I wrote mediocre to acceptable in the title because if they food was better than average/very good, place probably wouldn't be low key at all.
I'm mostly looking for a place with no hype, but I guess asking on here would defeat the purpose...
I used to be extremely critical of the Plaza Cote-des-Neiges, the shawarma place had dry meat, the persian kebab place had dry meat and lukewarm sides, pita burger had bland everything (especially the fries), the defunct northern chinese place was dull, the defunct carribbean (Marrie's) was decent but microwaved, same with its replacement Village (Vallage?) Singapour. I've never tried the chinese and chinese-thai.
Recently I tried the sushi place Goong Sushi right next to Pita Burger, and I have to say I was quite satisfied. Better than Sushi Shop, and various non descript sushi places. It's nothing that really stands but still exceptional value that can't be beat if you are in the area.
Momoyama in the Carrefour Industrielle food court has nice Katsu plates with tempura veggies, rice, salad and miso soup for about 10 bucks.
The last 2 aren't exactly low key since they have been talked about quite a few times on here, but Nilufar is probably the last remaining true dirt cheap eat there is in Montreal. And Poutine Lafleur in verdun has had some positive vibes from people on here many times although I haven't been back in over a year now. Everytime I have tourists who want to try Poutine for the first time, I tell them to skip la Banquise to go to Poutine Lafleur instead (of course nobody ever does because Verdun sucks and the Plateau is prettier and more tourist friendly.)