It's a brilliant essay, but then what do you expect from Paul Graham? It's eloquently put and finely crafted. This is a really interesting analytical tool.

I think there's some amusement to be found in an agreement hierarchy:

  AH-0: Raw compliments.
  AH-1: Ad hominem compliments.
  AH-2: Compliments on style.
  AH-3: Agreement with the main point.
  AH-4: Extension of a minor point.
  AH-5: Major corollary; extension of the main point
  AH-6: Citation to make another, more overarching point.

Can anyone beat me up the ladder to AH-5?