OK i own the series and the movie, and all i have to say is this: the movie sucks sweaty trucker balls compared to the series. They changed the characters, removed a few even, changed some of the basic premises that build the storyline, altered the body count, altered the final victor, altered the relationships between half the characters, neglected to explain the whole "Gemini/Twin Star" thing, and exactly WHY Fuma becomes convinced that he is Kamui (He is infact Kamui, or more accurately, he and Kamui are two halves of the same coin. Whatever Kamui chooses, Fuma is destined to automatically fill the opposite position.)
Plus i think the movie neglects some of the finer aspects of Dark Kamui's (Fuma's) personality. He isnt "evil", just like Kamui isnt "good". Basically, Kamui is fighting to save people at the potential cost and sacrifice of planet Earth, whilst Fuma is fighting to save Earth, at the cost of the human race. Both sides have completely valid reasons to fight, it isnt just an apocolyptic battle between good and evil. Unfortunately, the movie just seems to paint Fuma as pure evil without a cause or motivation. Yes, he kills his sister in both the movie and the series, but what they didnt mention in the movie is the reason that happened is because Kotori was born to die at the hands of the Dragon of Earth, to cause the Dragon of Heaven enough pain so that the final battle would be set in motion. Without her sacrifice, none of it would have played out.
And they also neglected to show that the members of the Dragon of Earth were capable of great compassion and were not "evil" as they were portrayed in the movie. Kusanagi, the big guy who can see Inuki, Yuzuriha's invisible dog, in the series falls in love with Yuzuriha and absolutely ADORES Inuki, and the feeling is mutual. In the movie, he's painted as a cold, cruel, callous and completely remorseless individual who would rape and murder Yuzuriha (and Inuki too probably
) just as soon as look at her.
They removed the following characters from the movie as well: Fuma's dad, Fuma's mum, Kamui's aunt (Tokiko Magami), the Dragon of Earth Dreamgazer Kakyou Kuzuki (they gave his dreamgazing powers to Kanoe, Princess Hinoto's sister, and replaced his character with Shougo Asagi, who was given Kigai Yuto's watercaster abilities). They didnt even explore the history between Sakurazuka Seishirou and Sumeragi Subaru(the black-wearing and white-wearing onmyouji at the start of the film, fighting on the skyscraper), they removed Saiki Daisuke, Aoki Seiichiro's(the windcaster) nephew and Princess Hinoto's bodyguard, from the movie, and altered the nature of Kotori's (Fuma's sister) death, although the original death scene from the manga is preserved in a single scene in the movie, when Kamui is having the "dream" courtesy of Hinoto, and sees himself with wings, running Kotori through and slicing her up. In the series, they showed the running-through, but not the slicing-up.
The subtitles were horridly wrong in some parts, the english dub was awful quality with half-assed voice actors who couldnt even pronounce the names properly, and the general storyline was way off track.
On the upside, they kept true to the fact that every time a kekkai ("barrier") is shattered, the area it was designated to protect falls to ruins. In the series, they just showed it as if the creator of the kekkai is killed, whatever damage instilled inside it is translated over to the real world. This is different in a few cases, a good example being what happens to Subaru when he fights Fuma. Even though he sustained a non-fatal blow, the fact that a Dragon of Heaven was defeated by THE Dragon of Earth, shattered the kekkai that protected that area of Tokyo.
So yeh, i have my issues with the movie, but only in comparison to the series and manga. In and of itself it is actually a great and rather entertaining, albeit slightly confusing, watch. But i strongly recommend you invest in the series. Its 25 episodes across either 6 or 7 DVDs, depending on what country you're in, and it is incredibly involving and quite possibly one of the best full-length series available today in its genre.
lol..anyhow at first i was like huh? and almost ot a little sad cuz i thought maybe i had wasted money and maybe i did but at after it was all said and done i liked it...kinda crazy but good i dunno what do you think...and i can't help but feel that maybe i don't know what i'm talking about or making an ass out of mysel 
hehe jk
jk
