Good, but with drawbacks

The game is really engaging, but once you hit the final league (the Diamond one) you realize that without constantly buying extra birds, youll never win the game.

So I think its not balanced well at this point, because not only the game is interrupted with advertisements each 4-5 turns you start a level, but also youre obliged to buy extra birds to win the final league.

It was very frustrating to me since its a game of skill, but you understand that finally your skill is not enough to win the game.

Kate140486 about Angry Birds Friends, v2.6.1