I finally saw Chicago last night and loved it. I'm a big dance and Bob Fosse fan so liking that aspect was a given for me. The performances by Renee and Catherine-Zeta surprized me. I never knew they could do song/dance numbers so well.
As for the story itself, it was interesting to me on many levels. The rise and fall of a "star", what some people will do to emulate another, how the innocent and voiceless can be punished unfairly, how people use one another and play games to get what they want, etc.
If it wins Best Picture, I won't be surprized.