I actually really liked that they made the robot really neurotic. It made him feel different from just another robot intent on destroying humanity. I think they could have made his overall plan a bit clearer throughout. It seemed that he was trying to make humans evolve by creating a new race of mechanical human-robot hybrids (not sure of the correct way to word it), and then destroying humans with the 'Eastern-European city asteroid'. I guess that was the point of the body that they ultimately put the Vision in. Maybe it was clear to everyone from the get go, but I was a little fuzzy on what exactly he was trying to do the first time I saw it.
Android? :-D
I did like that it was a matter of him wanting to do what his original programming dictated - save the world - and not like the comics where he just hated humanity or his creator or whatever it is based on the writer. This made more sense.
But I don't know; robots seem like they should be "perfect" and not prone to neurosis or other similar human flaws.