If the Warmilte tent has indeed degraded that far, soo far that it *looks* like home made stuff after the years they have been in business, I would return it, too. This is the ONLY way you have of protesting a bad product. If, as Roger says, all their gear is getting shodily put together, they need to know about it and, make changes. They have not changed their catalog in MANY years. They have good light stuff. Shody workmanship can easily destroy that reputation. They charge a lot, you have the right to expect a lot in return. If they do not deliver on that, this is a problem with the company, not with your actions. Reliance on past performance does nothing to fix a leak, or help you repair a torn out seam in high winds. They NEED TO KNOW. It is hurting their business to produce less than high quality gear.
That said, I agree with Franco. If I really liked a piece of gear, I would have remilled the poles, Added some stitching to compensate for the loss of strengh, and kept it. As I say, mine did NOT look like that, soo, they CAN do good work, sometimes. The design for that tent is good, except for the wet entrance and exit.
But you should feel comfortable with your decision. Basically, you are doing everyone a favor, the manufacturer, yourself and the rest of us. Thank you!