I have found Coleman equipment to be pretty dependable, so I am not surprised by you experience.

But once you start carrying everything you need on your back, weight becomes a key issue. That Coleman tent probably weighs something like 8-10 pounds. For a three day trip, it will still work fine.

But when you leave for a week, and carry all of your food with you, that ten pounds is a lot to carry on your back. And that's why most of us carry tents that weight something under five pounds, and often much less.