In my opinion, you're not missing much. My wife likes their coffee so much, I have to buy the grounds at the grocery store. It's also where we tend to stop for fast food most often when we're on the road because my wife is vegetarian and thus has only found two major fast food chains (i.e. that can be found anywhere) that she can eat at: Tim's and A&W.
A&W is my usual quick breakfast choice. Totally different in Canada from US. Coffee is OK, but Tim's has never been as they were since they switched their beans.
And McDonald’s now uses their beans I have read. I’m not much of a coffee drinker but many people I know who are insist that McDonald’s coffee is the best. At work they insist that is what we buy for the coffee machine.