It was amazing. Unlike 1.0, the majority of the plot had been redone. The angels looked very different from the original, and the Third Impact happened right after Shinji defeated Zeruel, the fourteenth angel. The most eye-catching feature of 2.0 was probably the introduction of the new character: Mari Illustrious Makinami, with a miniskirt and stockings and eyeglasses. Not everyone likes her, but at least I do. I think the character of Asuka had changed a little from the original. I used to dislike the original Asuka, but this one in 2.0 was much more lovable. Unfortunately, she was quarantined after being infected by Bardiel, the thirteenth angel.
Nonetheless, the indisputable heroine in this movie was Rei Ayanami. It was explicit that Rei was fond of Shinji (and vice versa), and she goes as far as planning a dinner to reunion Shinji with his father, Gendo Ikari. After Rei being eaten up by Zeruel, Shinji yelled "Give Ayanami back to me!" again and again while Unit 1 destroyed the kernel of the angel and Rei was saved by Shinji. In the end, Rei, in the deified form, were hold tightly by Unit 1, now in "a form of being superior than man and close to god".
Right after the ending song, Kaworu Nagisa appeared from the sky and threw a spear (probably the Spear of Longinus) which went right through the body of Unit 1, ending of the movie.
I enjoyed this movie very much. It made possible many of my preferred improvements to the plot of the original TV series, including making Rei a more central role, and the mitigation of Asuka's character. Also, the newly introduced Mari was an attractive girl. By now, I really have no idea where this story is heading to - the Third Impact had happened, what could be next? Anyway, there are two episodes of this epic tetralogy, and it is definitely worth the wait.Image source: http://www.flickr.com/photos/taishaku/ / CC BY-NC-ND 2.0