Eliza

1. I did not feel like Eliza was very human like.  She seemed to repeat the same things over and over again, until it was quite boring.
2. Have her give a wider range of responses.  It just feels like the programmer was lazy.
3. Well, since it is programmed by humans, there can be a wide variety of different reactions to different things.  You cannot expect the programmer to predict all of the human emotions, and have the program accurately respond.
4. Not really, no.  They are getting closer, but even things like Clever Bot or Siri make no sense sometimes.