@browncoat - I don't know, I think that people are able to respond to machines even without overt displays of emotion. Even now, there are all kinds of robots in Japan especially which people tend to get attached to, and they are designed for that purpose.
And isn't emotion just another aspect of intelligence? Or at least something else that could be programmed into an advanced machine? I mean, what is fear except wanting to be away from something that we don't like.
Love might be a bit more difficult to quantify, but I'm sure it could be done.
Artificial intelligence software can already program "fear" into a machine. No, it's not going to have sweaty hands and a pounding heart, but if you took all the physical things away from fear, what you would be left with is an aversion to doing something and that can easily be put into a machine.