Why do you think Angry Birds is so addicting?

Angry Birds just released their latest and highly anticipated update which includes the Mighty Eagle.

If you haven’t heard of the game that’s making iOS Gaming history either you live under a rock or just don’t care for games, which is sad. In such case you still want to answer my question, there is more info on it here.

To the people who play this amazingly, fun game on the multiple mobile platforms out there (I know there are some of you out there in Fluther!) I want to ask you, based on personal opinion, why do you like the game so much and why is it so darn addicting?