Most common of all, though, are the claims that if you just have a great team full of great developers, you don't need a process. Agile and waterfall both be damned.
But most teams aren't great. Most of the teams of people participating on HN statistically aren't great. But those teams still need to develop something -- banks and big cos and countless firms are churning out code by the millions of lines, by millions of completely average developers -- and agile is an honest conclusion that the classic method of software development doesn't work, most critically by biting off work in such enormous chunks that implementation or design issues -- the fit to the problem -- aren't discovered until enormous efforts have been wasted.
So talk about how agile failed, in your estimation, at some shop or another. But the truth is that almost anything would be a "failure" versus the idealized notion of a perfect design built expertly by great developers. Agile is trying to make the best of a normal situation.