Review of Lord El-Melloi II's Case Files: Rail Zeppelin Grace Note - A Grave Keeper, a Cat, and a Mage
It's only an introduction so don't expect too much from that one episode by itself, the art and sound are good, the way they handle the characters and the link to Fate zero is well done, so personally, I'm definitely watching the series when it air. That said the story of that episode is nothing great, it shows us that while Waver situation may have improved he still looks down upon by other mages and has made enemies some of it who even try to kill him, but nothing more. Aside from Waver and Grey (his disciple), most characters are only introduced by their link to knowcharacters or their position in the association.
But once again story or character development clearly are clearly not the goal of that episode which is just here to give a quick introduction on what happens to Waver, the situation with his disciple, the setting in general, and the art and sound; the rest can be left to the real show.
The atmosphere is also looking really good, kinda similar to "The ancient magus bride", and it's cool for once to get a Fate series not center on a holy grail war of some sort, since the only other I can think of are Kara no Kyoukai which is only loosely connected to fate and Fate food and Carnivals phantasm which are comedies.
Overall, I think it does a really good job as a teaser and introduction to the upcoming anime.