I hazard that its not so much the game itself but the climate within which it was launched and advertised. Saying that, i imagine there were probably enough similar if not identical games that would have failed miserably, in which case Angry Birds set it self apart with simple gameplay, story line and characters.
I do find it depressing that this is the only thing people can bloody go on about though.
I do find it depressing that this is the only thing people can bloody go on about though.