Hellsing: Psalm of Darkness is a promotional video for Hellsing, the original series.
Which works quite fine as a trailer and it quite lovely to watch as an hellsing fan, I feel like watching Hellsing again :3
But when that is said it is in fact not a real trailer for the Hellsing, the original series, because you will get to see things which are only in the Hellsing Ultimate version, therefore this trailer shows that while the developers where making the first adaption that they changed in path later in the development.
The art is good but it is only as good or maybe a little bit
less than the original, compared to hellsing Ultimate with gorgeous eyecandy/eyeorgasmatic visuals, it is only meh.... Should that really stop you from watching it? No I don´t think so, it is hellsing for bloody sake :P And if you have a fancrush on Alucard then it is all that is needed XD
As a trailer for newcomers to hellsing... hmmmm then the visuals doesn´t really show what the series really can offer, but it gives a great picture of the setting without really spoiling :)