Personally I thought it was a lot worse than Bakemono. It had some great humour, and I loved the quasi-philosophical thing it had going on (Is a completely identical impostor less real than the original?), but there was just far, far too much fan service. It's anime, so a certain amount of unnecessary fan-service is par for the course, but they overdid it a bit in Nisemonogatari, IMO. Bakemonogatari was much more interesting.