Now fans of the game Angry Birds are finally able to find out why the birds are so angry, through the origin story that is their full-length animated feature film, The Angry Birds Movie.

If you loved the game, you might enjoy the script that stays faithful to it, with all the requisite elements brought to the big screen: giant slings, teetering towers, booming effects. If you're not a fan of the game, though, you yourself may become angry by the simple, predictable plot.

There isn't much going on that truly stands out. It takes us to Bird Island, where life is peaceful and good-natured. We see the parent birds cuddle their chicks and everybody orderly crossing the road.

But there is an outsider on the island: Red (voiced by Jason Sudeikis), a grumpy, squat bird with thick eyebrows who loses his temper easily.

He is hired as a clown to deliver a "hatch day" present, but he ends up throwing cake in his clients' faces. After the incident, a judge orders him to attend an anger-management class, where he meets Chuck (Josh Gad), a fast, yellow bird, and Bomb (Danny McBride), who blows up when he gets mad.

The three learn to manage their tempers by practicing yoga, reading poems and painting with a beautiful white bird, Matilda (Maya Rudolph). But before making any progress, mysterious green pigs arrive and destroy Red's beach house.

But the pigs bring free food and interesting gadgets. There are parties and talk of peaceful coexistence. However, Red is the only one suspicious of the pigs, who seem to be harmless and generous.

As predicted, one night the pigs steal all the birds' unhatched eggs and rush back home. Then comes the familiar story from the app: the now-angry flightless birds throw themselves to the castle of the pigs, knocking down every building on Piggy Island.

As you see, the plot is predictable and too simple for adults, but it still could please two types of people: the die-hard fans of the game and kids who are too young to quibble with anything.

Nonetheless, nearly all the game's birds pop up and show off their attributes. The big-screen format also gives them more fleshed-out personalities, and their various traits add fun.

Mighty Eagle (Peter Dinklage) in particular is regarded as a god on Bird Island. He is an ex-hero, but now lives on the top of a mountain, and is seen grooving to 1970s disco when the trio turn to him for help.

The computer-generated effects are not bad, though. The 3D version expands the landmarks and the details for the big screen, especially in the scene when birds take Piggy Island.

The problem with the movie is that it doesn't spin a more imaginative story. The focus is too narrow and assumes the audience only wants to know how the birds got angry.

The script could have been more mature, have more twists and turns, instead of simply giving an excuse for flightless birds to invade the pigs.

(From top) Scenes from The Angry Birds Movie Photos: CFP

Everyone's a critic

GT: Do you think it is a good adaptation of the game?

Shiwei, 30, teacher

"I have played this game, and I didn't go into this movie with very high expectations because I find there is no need for a movie. But it was actually hilarious! Even though there's hardly any anger among the characters, there is a lot of humor, both for adults and kids. I was laughing out loud every second of this movie. I think I will probably take out my phone and play another round of the game."

GT: Who is your favorite bird?

Austin, 28, sales

"They are all cute but I like Mighty Eagle best, because you don't see him very much in the game. It surprised me that they put him in the film and gave him fun personality traits. He is narcissistic and talks big and cool. He is a hero worshiped by the birds, but turns out to be a hippie."

GT: Did the film live up to your expectations?

Vivian, 30s, editor

"Yes. Both I and my 4-year-old son enjoyed the movie. My boy had a few good laughs from the very beginning to the end. He said those fluffy flightless birds are so cute and funny. And I think the birds in the film largely stay true to the original game franchise - from their appearance to personality. The film is also a technical triumph. The birds are so artistically and vividly rendered that you can even see the nuance of not only their various expressions but also colored feathers."