Starbucks... depends on the roast. Their best roasts top this group, the weaker ones... don't. Second cup, same thing
McDonalds coffee is actually surprisingly good.
Tim Horton's coffee is disgusting. It's not bitter, it's sour - it's made to taste good with a ton of cream and sugar, and is gross without it. However, if you're stuck in canadastan and have to go to tim Horton's, worry not. They can make to order a (machine made) Americano for less than you'd pay for a coffee at starbucks. Is it the best Americano out there? No. Is it perfectly drinkable? Yup. Just expect it to take them 20 seconds to find the Americano button when they punch in your order. For some reason they barely publicize having them.
The only one I've tried or heard of is starbucks, I generally don't like coffee but they have some coffees that I love, and they're cheap if you go with someone cause they give 1+1 free