Heh, yeah, Black Rock Shooter was pretty ridiculous and substandard as an anime. It's pretty enjoyable if you're not expecting something of quality, though. The scene at the very beginning that doesn't connect to anything later on at all whatsoever is still rather annoying, though.
The entire BRS phenomenon seems like it's made of half-hype, half-fandom. Objectively, what are you going to expect when you try to make a whole anime after a kind of cool song (that you only ever hear a single riff from throughout the entire animation)? Subjectively, it's widespread enough for me to have seen some furry wearing a BRS shirt while I was at the convention in Atlanta this year, and for me to have subsequently recognized it.
The whole thing's kind of weird.