What about the story ? As already stated in the comments, Angry Birds is almost identical to "Crush the Castle", another game, of which Flash versions were quite successful but mobile versions weren't. (It involves destroying castles with a trebuchet -- play it here: http://armorgames.com/play/3614/crush-the-castle ). It would have made for a more interesting article to compare Angry Birds and Crush the Castle (CTC)…
While your point is very good and valid, it was the article's goal to focus exclusively on the interface, that is why it doesn't mention the story.