Now that’s a complicated one. Both the question and Kakashi’s thoughts…
I think he did want to take on Team 7. Maybe wasn’t so convinced it was a good idea or that he knew how to teach them, but he has connections to Naruto and Sasuke.
I don’t think he expected to really care for them as much as he grew to. Really care, as people, not just as comrades he won’t let die. And of course, I don’t think he expected how much trouble they would get into and how often he would worry about them. Kakashi is a person who has lost a lot of people – not being there, being too late, making mistakes… – and I think he’s pretty desperate to not lose any more.
-Silver Queen