Planet 51

Planet 51 is a 2009 Spanish-British-American movie 3D computer-animated science fiction comedy film directed by Jorge Blanco, written by Joe Stillman.

Plot
Lem is just an average teenager working on getting the girl and furthering his career at the local planetarium - except that he's an alien. At least to U.S. astronaut Captain Charles T. Baker who lands on Lem's planet hoping for a quick flag plant and a hasty return to earth and his millions of screaming fans. But on this alien planet the media has tagged spacemen as brain-eating, zombie-creating monsters, causing Baker to run for his life and into Lem's house. Now it's up to the green native to get the clumsy astronaut back to his spaceship before military dictator General Grawl and mad scientist Professor Kipple manage to exterminate the Earthly visitor.

Bad Qualities

 * 1) The Humor is pretty hit-or-miss. While a good amount of it is funny, plenty of it is unfunny being pop-culture references/jokes and innuendos. There are also some moments of gross-out humor, like the cork joke.
 * 2) Blatant product placement: particularly, there is a scene of Twix candy bars, as well as an iPod-looking device and many obvious references to other science fiction movies, such as Star Wars and the Terminator.
 * 3) The action scenes are so lame to the point where even the action scenes from other bad and mediocre alien movies have done better. The stuff that happens in the scenes is very generic and can be seen in many other films.
 * 4) Misleading poster: In the film's poster (as seen above), it shows that Chuck Baker is the main character, but he's actually a side-character while Lem is actually the main character.
 * 5) Lem's story is just a generic teenager story and it could be cut out.
 * 6) While the animation is decent, it has some flaws. Like first off, every background character has the same walking animation, which is lazy. In some scenes, some of the characters don't move at all, which is also lazy. The alien planet is far too earth-like. For example, the grass is green and the sky is blue, a boring visual that could have been avoided by choosing any other color.

Good Qualities

 * 1) The animation is pretty decent, despite the flaws as mentioned above. The overall artstyle is actually pretty interesting. Certain scenes can look stunning, such as the scene where the main characters are in space.
 * 2) Good voice acting, despite talents being wasted, such as Dwayne Johnson as mentioned above.
 * 3) Some funny moments here and there, like the scene where Chuck first encounters the aliens. Also, lines such as "I can shoot myself" are funny.
 * 4) Great soundtrack, especially the 50s music.
 * 5) The characters, while not that interesting, are likable enough. Also, Rover is a funny and cute character.
 * 6) The concept of a man who discovers a planet inhabited with aliens who behave exactly like humans sounds somewhat original and unique.

Reception
Planet 51 received mixed-to-negative reviews from critics, and currently holds a 22% approval rating on Rotten Tomatoes, based on 108 reviews, with a general consensus that states: "Planet 51 squanders an interesting premise with an overly familiar storyline, stock characters, and humor that alternates between curious and potentially offensive." On Metacritic, the film has weighted an average score of 39 out of 100, indicating "generally unfavorable reviews." On IMDb, the average score is 6/10.