"Why add a mistake to the movie?" Was my first thought.

How could Greedo miss point blank? It seemed ridiculous.

Then when I heard that GL did it to make Han Solo not seem like a cold blooded killer my second thought was "Who the hell thinks that?"

It was almost the same scene from Raiders with the swordsman.

He didn't change that scene. No one thought Indiana Jones was a cold blooded killer so why change Han and Greedo.

It was just a "I don't have time for this" shooting. I thought it rather cool and comical at the same time; for both Raiders and ANH.