Why? Is it because the color palette isn't filled with grays and browns like in Transformers? Its not supposed to look uber real. Its supposed to look good instead.

The art style is absolutely stunning. Its the highlight of the movie. The vibrant red and green hues bouncing off the robots when they fight in hong kong sold me on the movie alone. It looks far better artistically than almost any of the recent special effects found in a big budget summer movie. Oh, and you can also coherently follow the fights and understand exactly what is going on... unlike another robot-focused movie I already mentioned.