A bit of a mixed bag, and it depends greatly, but I would answer with a qualified yes. I used to not think so. Then I burned through the cheaper brands while the more expensive pieces still are holding up. Can't speak to dead bird clothing but their packs are pretty stellar. The thing is, you can get some of the primo brands for cheap if you have pro deals or find the sales. So, if you can get a "primo" brand for almost the same price as a second tier brand, why not right?
And to answer your question more directly, for a weekend climber, who obviously climbs less than some, quality is obviously less important because wear will be less.