Nisemonogatari (with my brother whilst he was back from Uni) 7/10
Not a bad show, and Kanbaru steals the show every time she appears, but fundamentally, I felt just wasn't as good as Bakemonogatari; the fact that a single plot arc which actually didnt feel that indepth got stretched over more than half the series didn't really help here.
That said visually its still an interesting if very 'Shaft' show, and if you enjoyed the first show it's nice to see a continuation and more of the characters, many of whom seem to have decided long hair is no longer in vogue (for shame!!).
It also seems quite unsure as to whether it actually ended on episode 11 or not! Certainly I felt the TV ending of Bakemonogatari was far stronger, even if that is influenced by me being a sap for romance subplots getting some closure etc.
As a show it also seemed to rely on mild fanservice a little bit too much, for no particular reason.
Kizumonogatari, given the subject matter, will hopefully be a little more fulfilling, as the relationship between Shinobu and Koyomi and its formation, and how Hanekawa ran into Koyomi are probably going to be of more interest to fans of the series and characters than the sisters whom are not really THAT interesting.