I quote myself for a moment.
The full film seriously is, together with the fake "Arkham Asylum" trailer, by far my most favorite batman fan film. very well done. not only does it show how wonderful film-noir and gothic horror can work together, but also how fascinating this mixture turns out if it touches the batman franchise. brilliant.
people have to stop comparing fan films to their own vision of "what batman should be" and should start to read between the lines. all it was, was another take on the batman myth, trying to show what would happen if batman would not be the "under control" guy but more this monstrous demonic creature that kills people, like it's been said in the urban myths. it is not TRYING to be 100% accurate to the source material because it doesn't HAVE TO. It just tries to be something different, and that's in a 70 year old franchise with tons of different interpretations of the character ABSOLUTELY okay.
You don't have to like it, because noone tells you to. Heck, it's your own right to dislike it. But comparing this to other interpretations of the character doesn't make the least bit of sense. Especially since we are talking about a character that got, in- and off-continuity, so many different takes that there, in the end of the day, exists NO definitive interpretation of the character.
For example, you say batman is "always calm and incorruptible and nothing in the world could make him want to kill". I say that batman is so interesting and fascinating because he is one of the few superheroes who won't suprise me if they would go off the line and kill since, for me, batman is ALWAYS wandering on a thin line between doing the right thing and revenge. And the creators of this flick think batman would go out and kill thugs all together. All these interpretations are based on so many different takes of the character in 70 years comic history. None of them is the "right take" on the character, but none of them is necessarily wrong either since all of them work in their OWN continuity.
Dislike the film if you will, dislike it because this take on the character doesn't work for YOU, but don't dislike it for trying something different. Because that's just unfair.
And, on a side note: that's not the way I would interpret or want to see batman in continuity either. But I still like it. It works, at least for me.
P.S.: I, for one, like french movies very much.