I've never dealt with their warranty department because I never have had to. My TNF gear hasn't had a lot of use (except my old mountain parka, that still looks in good condition), but no problems with any of it at all. I've used TNF tents and own two down parkas

Backpacking gear doesn't last forever, whether or not you think it should.

Bashing TNF has been a cottage industry for a long time. If you don't like their stuff, go buy something else.