Given the relatively few dining options in the vicinity of the Fairmont, we ate at Wickets a number of times. We ate with our two small children each visit.
The staff is very friendly and very nice to children. The food is fine. It's all hamburgers, but they do have turkey burgers and vegetarian options.
The main issue is the service is just incredibly, incredibly, consistently slow. Typically 10-15 minutes between being seated and being greeted by your waiter for drink orders. Over and over on multiple days we saw guests getting up and leaving before their waiter made it to the table. We left one day as well. Again just an incredibly long time between placing your order and getting your food.
Kids under five eat free, although you do have to request they honor their policy.