Bijou is the only restaurant within the Montreal Marriott. It's also the only one within walking distance, unless you want to try your luck in the airport. Consequently it suffers from "the only choice around" syndrome: It's attractive inside and the food is decent, but the prices are very high.
The breakfast buffet here was $24 - Not very cost effective if I just wanted a pastry and a bowl of fruit. Even when I ordered a bowl of oatmeal from the menu, it was still almost $20 with coffee and tip. At least work was paying for it.
A nice positive for Bijou was that the lounge and bar were open until midnight. Their pours were quite healthy as well. Since I was still on California time, sometimes an 11 pm nightcap was just the thing to get me sleepy enough when my body thought it was 8:00.