To be able to do a full criticism of it, you really need to be able to do markup on it. That is, you need to be able to add a layer of commentary on top of it. Currently, the only way to do this is to copy the whole bloody thing, and then embed your own layer of markup into the copy. This sucks.
The idea of marking up text is hard coded into things like the Torah... which is 5000+ years old... yet the wizards that give us toys like IE, Firefox and Chrome can't seem to grasp this concept.