Surprisingly nice place for a chain! Not a taste twister, but definitely decent drop-in location if you are hungry.
Friendly, quick and useful service. They even speak English and are not pissed if you do - a huge bonus around Montreal area.
The food was very good! Big portions, excellent quality. Not a high-end restaurant level with custom food, but something absolutely decent and eatable.
Overall, I would compare Marathon to a Red Lobster in its better days. Type of food is different, but you know what I mean. :-)