Keen quality is about as bad as it gets in the outdoor footwear industry, and Keen is more than aware of it. I have a hard time faulting them for it, really. They started out as a sandal maker less than a decade ago, so it's hard to put them on the same level as century old footwear makers like Zamberlan, Asolo, Fabiano, etc.
There are plenty of people who say they've had great luck with their keens. In many cases, those are either users who bought their Keens prior to 2008, or they just don't use them hard. I suppose some just got lucky. Others have unusual standards. The poster above said he made it 280 miles in the Himalyas before his delaminated. I would expect a boot to wear out before it came apart. By 2008, so many people had consumed the Keen Koolade, sales demanded the addition of two new factories and things did not go well. They had to expand production so they could sell through fashion stores like Dillards and Macys. Hardly your hard core outfitter. By 2009, quality was so bad, Keen was sending entire containers of product BACK to their Chinese factories. By 2010 a multitude of specialty dealers had dropped the brand because it was such a headache. Our store sells roughly 3000 pairs of shoes and boots a year and in 2009 we sent back roughly one out of every nine pairs of Keens we sold. As an example, we send back one pair of Asolo per 75 we sell. We've never sent back a Kayland. We've had maybe one or two Scarpa failures. Soloman has had just a handful. Keen failures are STILL such a common thing, they don't even ask to see the failure, they just send us another pair, sometimes two just in case.
Keen has since moved production to new factories in China, and production is WAY better than it was in 2008/9, especially during their water-based glue days, but they haven't changed their designs, which they admit will probably never be the ultimate in durability. When you make an outsole with as many as five separate bonded components, it's likely they'll come apart.
Even today, I can often pull a Keen out of the box and peel a lug off. We only recommend Keens for the very most light duty of users. Keen fans are a funny lot. We've had customers blow up half a dozen boots in the span of a year and they still won't buy anything else.