We went to Marben for brunch last week and it was pretty good.
Food was really good. I had the french toast and my friend the burger. Both were fresh and tasted great. I have to take off one star because there wasn't much fruit available with the toast (though the bacon option does provide quite a bit).
Service was great--the waitress was constantly making sure we had bread/water while the food was being cooked.
Overall I'd say it was one of the better brunch places I've been to in Toronto. Still, compared to some of the great brunch places I've been in NYC, the limited selection and (specifically for brunch) limited amount of fruit-friendly options keep this at 4 stars.