I wish that just once a SEO person that complains about their ranking sucking (like after the Florida update) could give a legitimate argument about why their site is more relevant than others. So far, all I've seen is lots of things like... "my anchor text is perfect", "my H1 and title tags are perfect", etc...
What I would like to see is a SEO type person pull some random person off the street, and convince THEM why their site is unquestionably more relevant than others ranked above them.
While I'm sure there are cases of mis-ranking (based on relevancy) out there, I think they are the minority. Search engines are machines, and they are fallible. But ultimately they are going for most relevant, not most optimized.