The restaurant is part of the Marriott there at the Montreal Airport. It's convenient if you've checked in so you can easily get to an early flight, and I suspect 90% of the guests are fellow travelers.
Service was good, with water promptly refilled and decent pacing. The decor is sort of corporate elegant ... all blues to match the rest of the hotel. Not something particularly memorable, but relaxing enough.
Allow 20 minutes for a crisply roasted Cornish hen. Very tasty. Fish is also fresh, and the salads are just lightly dressed. Decent beer and wine list.