Story - 23/35 - The story isn't bad, but it is noticeably worse than Bakemonogatari. Since there are only 2 stories instead of 5, there is a lot more "filler" than there was in Bakemono. Even the filler is worse. A lot of the filler is fanservice, and there is much much more in this show than the last. The only good fanservice to come out of this show was the toothbrush scene (Don't judge me). The stories themselves are just as good in my opinion, just too long. This show probably could have been 6 episodes long instead is 11, which tells you how much filler there is. I liked the ending for each arc, and how they were tied together in the end.
Characters - 25/35 - Bakemonogatari was good because of it's characters. In Nisemonogatari, all those characters are there, they just take even more of a back seat. My two favorite girls, Hitagi and Kanbaru, are even less important now. Araragi is even weirder than he was before, sexually harassing both his sisters multiple times. Because of this, I found his character to be less enjoyable in this show. His sisters were very fun though, as were the villains.
Sound - 12/15 - Because there is only 2 girls, there were less openings. They were still very good, but in this case less isn't more. The background music didn't sound much better than that in Bakemonogatari. Overall there really isn't much to say here.
Animation 12/15 This was a big step up from Bakemonogatari. None of those stupid flashing screens with words anymore. Thank you. It would be perfect if the scenes weren't so oversexualized. Just like how the story had more fanservice than its predecessor, this show had way more sexual scenes. For example, Araragi's sister bent down to pick him up, so of course the show has to give us a close up of her ass and crotch. Things like this arent story related and I feel have more to do with the animation decisions.
Overall - 72/100 - Both the story and the characters take a hit in Nisemonogatari, while the animation gets a much needed bump. The story here was the biggest letdown. While the Fire Sisters and the Villains keep the characters interesting, the sheer amount of fanservice and filler hinder the story way too much.
