Hrm ... well, Ai was hands down my fave heroine from season 1, so for me just seeing her pop up on the screen again was a big consolation.
One of the things I like best about Ai is that she is so "normal", when it comes down to it.
But I must admit that I felt extremely sorry for Ai ... poor girl - although my suspension of disbelief was kinda challenged by the cram school kidnapping as well. :\
All in all it was enjoyable, though.