Inconsistency can certainly break a game, but where's the inconsistency in Angry Birds? I've got three stars on every level through the first ten worlds, and o

Inconsistency can certainly break a game, but where's the inconsistency in Angry Birds? I've got three stars on every level through the first ten worlds, and only a couple of levels seemed to require lucky breaks for maximum points. 3-1 was the one time I gave up and found the three-star solution on youtube.