Trend: Deliberately Crooked (Diagonal) Portrait Shots

When I read this I can't help but think back an interpret it based on my architect studies. I'm not saying that I approve of this "trend" but I can definitely see where they are coming from. Many look upon photography as art and in history art trends have followed many parallels to this.
For example you would represent the "classical" school of the renaissance with pure lines and clear rules. Sooner or later someone will look upon this an say; how dull! In comes the baroque. Wanting a more dynamic image they start by breaking these rules and try making up new ones. This turning the camera would be a way to try this but usually not a very good one. For a beginner it is easier than actually properly interact with the model and get the dynamic that way.
The problem is that while this can give great results it is a lot more difficult without the old rules. The new rules are harder to see and more complicated. Hence most end up being rubbish but in the hands of the few who actually master it the result can be stunning. Ofcourse, portraits are not really the best place to look for these but I have seen some really good street photography that do the basic principle justice.