So, I watched B: The Beginning and Fate/Apocrypha.
B: The Beginning was pretty much a classic case of a grimdark wannabe-seinen show let down by lacklustre animation, ugly CGI and, above all, atrocious writing. That said, I didn't drop it and I'll watch series two. It was okay.
As for Fate/Apocrypha,I'm biased when it comes to Fate stuff but I really enjoyed this a lot, even more than Fate/Zero and the more recent Fate/Stay Night (UBW route) series. I was already familiar with the story and all that, but the animation was, to put it frankly, pure pornography. Very happy with how it turned out and I'd recommend it even to people who didn't have the patience to sit through the slice of life shit of the other two shows mentioned.
I still need to watch the Fate/Stay Night (Heaven's Feel route) movies that have been released so far, but I've been stuck for time due to work.