[fooqux]

There are plenty of people who do follow it correctly, and have done so in the past. I've been on some of those projects, and I've even ran some (although I'll admit I'm biased there; the devs might tell another story). Hell, I've heard prospective devs during the hiring process say that they would have walked if we didn't use Agile. The fact that Agile became popular should attest to the fact that it can work, but with that popularity comes the people like this article mentions that just read a 1 page synopsis of an Agile framework and then try to use it with no further training.

The primary reason IMHO for why Agile fails isn't due to the principles of Agile or any of the frameworks. The reason is that Agile shifts the balance of power and gives much of it to the devs. It requires trust in the people you work with and who report to you. Many people can't seem to give power up, or they come up with excuses for why they can't trust their people and must continue to "manage" them. This sabotages the entire process.

Moving to Agile is not a process change. It's a culture change, and those are hard.