Mandarin is the "Tim Hortons" and/or "Pizza Pizza" of Chinese food: create a product that's suitably and consistently bland, hype it endlessly, and the people will trample each other to get to your door.
95% of their food is so innocuous my grandmother would happily eat it; even the "hot sauce" they give you isn't really hot. On the few occasions I have been pushed into going there, I noticed that most people seem to fill up on carbs, which explains why they are so profitable...who can eat $30 worth of carbs?
Their chicken wings are OK, and a couple of their pot stickers are palatable. Additionally, if you want to spend ages ferreting out tasteless crab meat from flimsy legs, well, knock yourself out.
To paraphrase H.L. Mencken: "No one ever went broke underestimating the palate of the Canadian public."