I'm not going to get into a flame war, but I have no idea what the other reviewers are on. This is an awesome anime, one that I own the DVD's for, from start to finish. The fact you can watch it her for free is just nuts lol.
So basically this is a story about a historic figure, Le Chevalier D' Eon, where the skeleton of the story is historically accurate, with the flesh being all fiction. IE the movements of D'Eon were true, his cross dressing was true, his sister and supernatural Psalms were not.
In the very end almost everything is explained (I say almost because its been over a year since I watched this, so sorry if my memory of it is a little fuzzy), and the last couple episodes resolve them in mind blowing ways. I don't want to ruin anything, but I knew there was a reason I freaking hated Robin...
Anyways the voice acting was indeed the weakest element. However its definitely in the tolerable to good range, a far cry from the crap people would put up with in the old days.
(I'm looking at YOU, X the Movie dubbed)
So in the end, watch this all the way through. If you really like, buy it. Share it. Its time that good animes like this spread and make profit, and fail series like Gurren Lagan get sent to the bargain bin for being the trash they are.