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Wall-E stands for Waste Allocation Load Lifter - Earth Class. Their sole purpose of survival was to clear up the garbage left on earth so that the people can come back to Earth to live. The beginning of the movie was so sad. I just couldn't bear looking at Wall-E working alone on Earth collecting garbage. And the most pitiful is the part when he had to collect the second-hand spare parts from his fellow out-of-service Wall-E robots to replace his own. I find it quite unbelievable that he was able to develope human instincts from time to time. But this is an animation, so it's still acceptable.
It then started to become interesting following the introduction of the female robot, Eve (Extraterrestrial Vegetation Evaluator), who came back to Earth to look for sign of life - plants. The first half of the movie revolved around the two robots - Wall-E who fell in love with Eve; and also the extremely aggressive Eve.
There was not a single conversation before the appearance of the people, as in the humans. But just like what KokChiang and ZiLin said, a good animation/cartoon does not need conversations, take the classical Woddy Wood Pecker, Pink Panther etc.
And Wall-E is sooooooo cute!
Just like any other Pixar production, it is moving, funny, cute, and irrelevant, especially at the ending. But then again, it is an animation, so it is still accpetable. I'll refrain myself from revealing too much. You guys should go watch it yourselves. It's another one of Pixar production that you can't miss!