I don't mind at all. As long as it isn't a subject I detest, talk away !
Sure, why not. It depends on where I am at though.
Usually, I don't mind someone wanting to talk, especially if it gives me an opportunity to talk about current events and I get a chance to tie several events and their relationships to one another together.
Of course last week when I was doing some last minute shopping at Sam's Club, 15 minutes before closing time, one of the assistant managers wanted to follow me around yak-yak-yaking and I wound up checking out with less than 1/2 of what I intended to buy. I didn't like that very much.
I had a long commute to work by train -- over an hour -- but enjoyed it because I got plenty of reading done. One acquaintance liked to sit next to me and talk. That was something I didn't enjoy.
One morning I said to him, "When we die, Alex, God is going to lock us in a room together. I'll be trying to read and you'll be trying to start a conversation. It's going to be Hell for both of us." He got the message and shut up.
So do I like people trying to start a conversation? Depends who they are, what I'm doing, and whether they have something interesting to talk about.
Absolutely I love talking to all people.